Really lonely

I am 16 and I have never had a boyfriend before. I struggle to talk to guys due to all the shade I got as a child as I used to be extremely  unattractive. I have never even had a guy admit to liking me. All my friends are currently in serious relationships so I spend all of my time alone.. I am really lonely and I really want a boyfriend and it's always so easy for other people but I can never find a guy who likes me. I don't know what to do and I feel like such a loser sometimes and I am starting to get depressed due to me being so lonely.