Yes, it does hurt when some people don't give you chance. However you can't force or make someone to hang out with you. I'm sure your a nice guy but if they don't want to include you in anything, then it's their lost. You have to move on and be grateful for the friends that you have now. I'm not sure if you are seeing a therapist, but these issues should be discussed with a therapist. I really sense self esteem issues.

Also, it's not a good idea to make assumptions. I know when I make assumptions, it drives me nuts. It brings a lot unwanted stress and anxiety. Through therapy I learned I learned it was all in my head and those assumptions weren't true.

Best of Luck.