I'm really confused as to why people have to give up a part of themselves when they're with another human being. Are you so full of self-loathing that you're willing to compromise yourself just to avoid being alone? Do you think that other person doesn't have their own hobbies and the desire to engage in their own leisure activities? Someone earlier posted that you have to be honest with a potential relationship, but I think it goes beyond that and you have to be honest with yourself.
No person wants to spend every waking minute with their partner. I love my wife dearly and I enjoy the time we spend together but I also enjoy the time I have to myself. I'm not going to give up the hobby I've had since I was 6 (I'm 36 now) just because she isn't a gamer. She'll use the time I'm doing my gaming to look up recipes on Pinterest, watch Supernatural on Netflix, or read. I wouldn't ask her to stop doing those things because that's what she did before we were together, and to even suggest it would be morally wrong.
Just be honest to yourself and to your partner. Never compromise who you are for anyone else.