You can be polite without being complimentary. Just avoid saying anything rude or confrontational. If you concentrate on being nice, they may surprise you by being less annoying.
Surrounding yourself with smart people isn't a bad thing, but make sure you aren't interested in friendship just to use that person for his intelligence. There has to be more...
Think about why you hate her, go through your memories, see why. If it is a good reason to dislike her, like she did something unforgivable, then it is okay....
Limit your time with this person. Or, spend time with him in a group or larger setting that takes the pressure off you being one on one, which can lead...
Tell your family to keep your identity private so that nobody tells your dad. Make it clear that you don't want your father to know that you are bisexual by...