The envy is making me a worse person

Whenever I see someone having fun with their friends, instead of being happy for them, I just get upset because I think about how I don't have any myself. Being lonely would probably be a better experience if I wasn't reminded of it constantly. I go outside, I see people having fun and talking with their friends. I go online, same thing, along with all the posts where they offhandedly mention their friends or SO. Don't get me started on media. At the same time, it's not as if they're doing anything wrong, or even thinking about it, it's just my fault that I'm feeling this way. Apparently I still can't get used to not having any friends, so I get upset at every reminder of it.

It's reached the point where even people talking about losing their friends makes me jealous of the fact they had friends in the first place. Like, why don't I ever get to experience a breakup? Makes me feel so selfish that everything leads back to my own feelings.