I have been married for 3 years now, and we are starting to struggle more than ever. He says he is happy but I am not.

Yes I got married at 18 there were I flet like I need ed my spece and my husband and I seperated for a year. But I had too many people tell me the good things about him and if I was you I would take time out to create a list all the good and the bad if the good outwieght the bad , then I would stay. I suggest you continue to talk with him and be patience.

If you don't have any children, then the problem you have isn't as serious as it could be. Marriage is often seen through the eyes of a religious document, however we must also account for for whaT WE now KNOW, in recent times about human psychology and personality types, which seriously impacts on whether or not marriage has any chance of being successful.
The concept of marriage is interpreted differently depending on cultural and race influence. It's important to recognise that a marriage in the western world isn't really controlled by the church. However if you have religious convictions about the sanctity of marriage, I think you should recognise that the Bible says that God sets up the powers of the governments of the world and that we should obey them. Thus any powers of marriage or divorce in governments are recognised spiritually. Here in Australia it's easy to get divorced legally. Some people may think that making it easy is not good, but I think that knowing it's easy to get kicked out makes people think harder about their behaviour in marriage.
Laws made for quantity are not a substitute for quality.
It isn't until you have children in marriage that real harm can be caused if things go bad. But we musn't make the mistake of remaining in a marriage just for the sake of the children if life becomes a depressive state of being.
Depression is a serious, joy inhibiting symptom of unhappiness. If depression lasts long enough one loses the ability to make rational decisions because the state of the person has become a mental termoil.
You need to consider that if a person has no problem with moving house ten times, then there is a problem. It often indicates hyperactivity and impuliveness in making decisions. Another thing to watch out for is changing jobs often, or buying and selling of cars often.
The above symptoms are usually associated with A.D.D. ADD can't be cured but it's effects can however be minimised if the sufferer will submit to councelling and a treatment. I consider ADD to be a personality type, not a disease. The problem is that ADD "often" isn't compatible with certain forms of realtionships such as marriage. The reason I say "sufferer", is that they and society are often negatively impacted through the type. ADD types are often very intelligent and are able to make quick desicions which is percieved as unusual. ADD also has the opposite end of the scale, which is recognised by the "slow" types. Those are people who can't make decisions, are afraid of shedules, need other people to push them to suceed and are often bullied at school by their opposites in ADD. These slow types often end up in relationships with the hyperactive types, resulting in children with various degrees of difficulties such as hyperactivity, slowness, speech difficulties, learning difficulties, savonts, ashbergers, good memory, slow memory, difficulty making friends, being bullies or being bullied, meglamaniacs, leaders, dogmatic, , smart or conversly easily conned.
To note however that each symptom is either on the hyperactive higher intelligence side or on the slow lower intelligence side.
So while it may seem strange that I'm bringing this stuff out, the reason is that you need to read your husband to see if it's even possible to get along for the long term.
Perhaps you need to ask him what he thinks marriage is and go from there.

Was there ever any good feeling in your relationship?
In all relationships, there are cycles. After 2 years, there is a cycle, usually after the honeymoon phase is over, that all relationships go through a difficult time of adjustment. Could it just be that, or do you really want freedom from the marriage, as it sounds you do, regretting it? Do you still love him?
You really should bring this up with him, as he might be the right guy for you, right? Ask him if he recognized any of your own small things you do, to show that you aren't happy. And just let him know, flat out, that you aren't happy. KNOW that a child will only make this worse, unless you address this.
Good luck.

You are right about marriage it has to have communication. Communication is mostly there for two people to talk out problems and be on the same page. There must be agreements on the important subject for both. If not marriage will be a struggle. Let me say this about most men. Men aren't good communicators about problems to their spouse. Men have other things that complete them, most importantly their work. A woman needs a man to be apart of them. If a man can't understand what his spouse needs that marriage is doomed. Because the most important thing to any marriage is communication. It's not just listening to the other, it's giving ones own reasons for....and coming to an agreement. A good marriage is based on agreements, based on reality through communication. Try to work it out with him. If he can't give you any reason or reasons to your viewpoints of what you are going through, tell him you want some space from him to think about your marriage.

It looks as if you are not creating the marriage, or not changing something. Marriage like anything else in this world it has to be created constantly. Otherwise it disappears. When marriage shows signs of boredom one then needs to change something or start a new activity to keep the marriage alive. Have you done that.
It appears not, so do that.