Feeling depressed lately

I (17f) have been feeling pretty depressed lately.I just graduated high school and ever since it’s been pretty lonely even when I was in school it was still lonely because I didn’t really have any friends but I guess that now I’m out of school it’s been more apparent how alone I’ve really been. Like I see other kids my age having fun and doing things and it just makes me realize how lonely I am.I just feel like a loser a lot of the time. I have no friends,I can’t get a job, and I don’t even have a love life for example I’ve never gotten attention from the opposite sex in my whole life and makes me question how desirable I am and pretty I am.The only time I have is when jokes were being made on me which I don’t understand what about my existence was so humorous even then idk why because I may not be the prettiest but I don’t think I’m hideous. And also when I used to get touched on when I was little which may have played a role in how I am now maybe.The only attention I get are from men online but that doesn’t really count and it just makes me more depressed. Sometime I just question my life and it feels like things aren’t that real. I just hope things will get better because lately I’ve been feeling pretty bad.