I don't know what to do

I hate being lonely. I watch my stap-fathers fiance and her family. She's so close with everyone. Her sister has friends she invited over. They're always laughing and talking and they all seem so happy. I can't make friends or keep friends anymore. I've broken off all contact with my old high school friends, but it wasnt because I hated them or anything. No, the reason why is because people just seem to drain the energy and life out of me. I can't focus on conversations and after I get close to someone I eventually feel like I'm just a burden to them or they don't want me around. I don't want to be lonely. I hate it. I hate having no one to talk to or make inside jokes to. I hate having no one to have deep conversations with or to tell someone about my problems and fears, but I don't know how to just stop being tired of everyone. I can't hold onto online conversations either. All those dating sites just make me fe weird. I hate it when people on there give me compliments or call me cute and all that stuff, but the loneliness is slowly killing me. I don't know what to do anymore.