Getting married? You have my most sincere condolences.
On a more serious note, some find happiness, and some don't. Depends on what you want and expect out of the relationship. Lot's of sacrifices, but generally for rewards that are (considered by most) well worth it.
You probably won't become a professional pool player, probably won't be able to do any road work, won't be able to buy any car that you want simply because you like it without taking family needs into consideration, won't be able to crash at a buddies place (without a phone call home) when you've had too much to drink, won't be able to blow large sums of cash on whatever you want without having to answer to somebody, and on and on and on.
As you can see, on the surface, there are lot's of things that you probably won't be able to do once you get married. But as in my case, you get to try to become one of the greatest husbands, and if you're lucky, the greatest "daddy" in the world. And, (of course this depends on what your priorities are) you might find that it's all worth it!!
Good luck, and congrats!
dave