Use college to your advantage. You will be able to find a few "weird" friends. They should give you a reason to spend time out of the house. Also join a club or two there. If you really have issues socializing put on a brave face and expect the worst.
Maybe even take some initiative to improve your relationship. Find an interest in one of his hobbies or do something fun every week or two. Try and take him out of the house.
But yeah he seems a bit nasty I am not sure how to make him accept who you are.
Also I find if a parent wants you to do something (like study extra hard) and they constantly chastise you about it... Your stubborn instinct kicks in.
But continue to be yourself, it should come naturally.