I’m an average 16 year old boy that goes to the gym, can communicate, is understanding, funny, smart, doesn’t smoke nor drink, but can’t make any friends. Around a year ago i started seeing that people just don’t want to be near me. No girl likes me, no one wants to hangout with me, and my old friends started ignoring me. I don’t know what i’ve done wrong, even my birthday was forgotten, no one calls me to hang out, and i’m starting to get bullied that i don’t have any friends. 
And in the rare ocassion somebody accepts to hang out with me, i see that he doesn’t want to be there, or that i’m a burden. Even my best friend that i’ve known him since i was a baby doesn’t talk to me anymore. They all made separate groups and hang out separately without me. 
I don’t know where i went wrong, but it’s starting to make me depressed, i’ve tried making friends through hobbies, high school, gym, parks, everything, but nothing worked. I even have a recent story about me and my family going on a vacation with a friends my dad has, and they brought a girl my age. We seemed like we had a great time and we were talking a lot, but when i got home from that vacation, she started ignoring me too. Right now i didn’t have any human interaction for like 20 days, and i’m starting to crave it but nobody wants to talk to me no matter how hard i try. 
Any advices that could help me in my situation? This story has gotten me crying in the bed several times and i think i’m becoming depressed, as i started losing motivation in everything, started to hate myself, and i’ve just stopped trying in everything i do, my grades have fallen and i’m struggling to get up from the bed in the morning, i feel like the only reason i’m not dead right now is because my parents are still alive and supporting me. Please help.