I can’t make friends because I have no friends

Am I cooked? I’ve felt like this for the past 4 years. I’m afraid that people will find out I barely have a social life so I over monitor what I’m going to say which leads to me not saying much, and also not saying anything interesting. Also the fact I don’t even get invited anywhere and thus miss out on those opportunities to meet people. I’ve met people through school clubs and jobs but those never turn into friendships because everyone already has their own friend group and it’s impossible to just break into an established group. Wtf is wrong with me? Like 95% of people can make friends just by being around people. I must be the most boring person alive.