Why can't I keep friends?

I don't have any friends anymore, like i talk to people in like all my classes but im always the person who starts the conversations and the person who makes all the jokes and people laugh and I LOVE making people laugh, like if they dont laugh i feel realy sad. well one time i had a friend in ceramics and we always talkd and stuff and then just one day like i dont even know why she just bearly talked to me or laugh at what i would say but she would talk to everyone else? my friend from last year we just drifted and stopped sitting next to eachother and stuff... and another friend from last year got mad at me cuz i said she was realy skinny in a joking manner not meaning to offend, and i apologized like 3 times but we havent really talked since and we use to text like crazy i miss it, and one more friend from this year we are still friends talking but she use to text me first but now its me and she dosent text back like im not important... i feel really sad like everyone i no will leave me and i will be alone when i grow up, and i cant make any boyfriends because there are no gay guys at my school... i feel like dieing, i dont know why these people are affecting me so much! :( am i to forward with people some people after summer act completly different but i feel i act the same, am i boring or something? anyways thank you for reading... :)