I know exactly what you mean. It tends to happen.....here's what I think.
First of all.....no matter what type of relationship you get into, you will be changing something about yourself, that's how two separate and close personalities combine.....by being open and respectful for the the other. Everybody changes, sacrifices, and gains something in a relationship.
But only if it is worth it........that would be the reason to do it.
Second, changing something that essentially has made you yourself, and first of all attracted this person to you, should not be greatly altered on their account. Like the way you dress, the way you talk, the way you ball up your socks, and the things that you have enjoyed all your life. If your being forced to change the things that make you, you, then you have to ask yourself if the relationship is worth it. Is it?

Don't let a man change you......you change that man, for the better. That's a woman job, to train those sob's.....lol......just kidding.

I hope it all works out for you,
Desirae