I'm thinking of never pursuing relationships because I always just assume whoever I'm attracted to already has a significant other.
Thats a shame! Did something happen to lead you to believe everyone has a significant other?
I was made to feel like an unwanted nuisance(
I'm sure you're not a nuisance!  You should get out there and pursue relationships with people you're attracted to.  Don't give up on yourself!
Bullshit, I don't feel like listening to your dumb advice.
If you don't put yourself out there you're never going to find someone. Sure you may end up failing a few times but it's better to keep trying than to give up. Or do you want to be alone forever?