Why shouldn't I commit suicide? I'm 20 years old

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Why shouldn't I commit suicide?

I'm 20 years old and I feel like I have nothing to contribute to anyone.
My friends who are way dumber and ugly, are way more successful than me. The bullies and assholes in my school are now very popular with their peers and get pussy left and right.
I failed a basic diploma course just because I couldn't manage my time and serve national service at the same time. This was basically the last chance I was given at education due to me constantly fucking up by being a lazy dickhead. I haven't told this to my parents yet because they will surely kill me.
I can't move out either because I'm living in the most expensive country in the world and as such, people usually don't move out until at least 28.
While doing national service as a fire fighter, my co-workers hate me. I'm incompetent and not really cut out for too much physical work. I continously train but also i constantly get sick and because of that, I just can't keep up. I panic at basic instructions and fuck up tremendously. I can't even make male friends studying in uni. They all smile at me and are polite but I literally never get invited to anything. In fact they invited me to class group chat on the last fucking term.
I have fully given up on getting a girlfriend, I don't have a good personality, my looks are average at best and I have no special talent or skills. I'm rich but not rich enough to be attractive. I haven't had a single kiss from a girl and the closest thing I have done was a hug.
I have no idea why I'm such a loser at all.
Both my parents are normal people with my dad being very smart and successful. Due to me being the sole guy in my family, I'm also expected to continue my family's bloodline as my uncle can't have kids.
This is fucking retarded. I have been letting literally everyone down my whole life. I haven't achieved anything for the past 8 years and probably won't anymore.
So please, someone give me a reason to continue existing.
Thanks!