I'm a normal guy that's going to die alone because of my stunted social skills

Believe me when I say this, I cannot make jokes or have fun in social situations. All I can do is say hi and interview like a robot. I'm the boring guy in the corner while the group next to me is laughing and having a great time. I don't know how to do that. Even one on one, I only make objective comments or can only laugh at someone else's jokes. I have zero substance to me. It makes me really sad because I could physically have a great life; I'm healthy, I have cool hobbies, I work out, and sometimes I even catch girls checking me out. Except none of it matters. All my social interactions hit a dead end within minutes. I can't imagine having a girlfriend; you can't hide this kind of thing for thousands of hours. It's like I'm stuck inside the body of someone whose life I don't want. I'm completely helpless socially and all the self-improvement in the world isn't going to help me overcome the fact that social skills and relationships bring you 90% of your happiness in life. I genuinely have nothing to say, ever.

I'm literally watching my potential waste away one day at a time and it's so sad. I honestly don't know what to do anymore. Even back in sixth grade I was looking up "how to improve your social skills" everyday all day after school, because I could go the whole school year without being talked to and I didn't know what I was doing wrong. To make it even worse there was this girl I really liked, and I think she might have liked me too, and there was nothing I could do about it because I knew nothing about how to socialize. She'd always be looking at me in class and one time she even sat next to me on purpose with our thighs touching and didn't move away first. Like I said, nothing's ever been wrong with me or my appearance. I'm just a rock in terms of personality, and even if someone does like me they quickly realize they liked absolutely nothing at all in the first place.

I know EVERYTHING there is to know about social skills and have consumed so much content, but I'm still the same mundane person. Nothing helps and I think about ending myself a lot. Sometimes I wonder if there's a version of me with the same life, except they're actually sociable and fun so they don't have these kinds of problems and it temporarily stops making me contemplate su*cide. Maybe I can become that person, but then again I've been trying to for almost a decade. Nothing changes and sometimes I think I'd be better putting a stop to this instead of watching myself slowly wither away.