i feel like a loner, please i need someone to talk too?

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im 15 years old (male), and i need someone to talk to and theres no one, i cant go to anyone, i feel like no one likes me, i have friends but like i just feel like im a loner, i used to be that popular kid in 5th and 6th grade then 7th and 8th got back now, im in 9th and i feel like sooo mad, iv had a girlfriend before, like alot but now i dont and i feel like theres no girl who likes me, and i dont talk to any girls, at all, i know im a good looking kid , not trying to be cocky but i just feel like i dont belong here, i started acting different in front of my family like, i dont talk to any of them and im never home and im the youngest of the family and there always saying i have no sence of humer and stuff,im not good at anything in life,im not smart. i cant go to my friends or my family cuz im not like that, i havnt told anyone bout this , i feel i need help.i feel depressed and stuff, like im crying while writing this