Classic, unoriginal rant incoming

I feel like shit and I'm finally seeing a therapist, and they told me that I had mild-to-moderate depression. So all my life I've felt alone, all my old friends were good people but they've gone to different places, and my current friends don't care about me. Aside from my parents, no one likes me at all. Nobody hates me either. I'm just nothing special, nobody is naturally attracted to me. 

Since last year I've been depressed, and recently it's been severely affecting my schoolwork. Last november I thought it was just burnout, and y dad said he went through the exact same thing when he was in college back in our home country, but he just grit his teeth and willed himself out of his rut. I wasn't able to do this, in fact I've given up on my future even though Im still in highschool. I'm giving up on my gym membership too, cancelled it yesterday. I know I'm naïve but everything is just too hard. The only thing I can do is go to work, I have a part time job I do 3 times a week. At work (I work at a family-owned takeout restaurant) once I get into rhythm and I didn't already feel like complete shit that day, I feel pretty happy. My boss is a great person and works right alongside us, and my coworkers are all nice people. He always cracks jokes and lifts our spirits. Its funny to me that I enjoy menial labour more than learning, especially since I used to be considered above average in intelligence, and almost universally considered to have great potential as an adult intellectually. I used to be physically strong too, I probably could've been an athlete had I wanted to.

Isnt this how people have always lived their lives? Constantly sad, finding some solace in work, and then dying alone and unimportant? There aren't any historical records of how normal people like me felt about their lives. In fact, people lived in WAY worse conditions back then, than what I live in. And yet I can't muster the strength to get out of my bed some days, and I'm constantly sad about nothing despite all the changes I tried to do. I'm completely replaceable, and in fact because I depend on my parents to live and they've sacrificed so much for me, and they used to ask me to be successful in life, but now they only ask for me to be happy, and I can't do either. Im physically weak and objectively ugly, I have literally never been called attractive in my life. The only thing I'm good at is making other people laugh, thats it, I'm just a fucking little jester to people, they laugh at my little jokes and then they don't hang out with me. I'm naturally funny and I hate it (I know because I make my coworkers and sometimes my friends laugh without even trying). I want to kill myself but I can't muster the courage to, so no Im not in danger of suicide. Requires too much effort. I wish I could. If I had a gun right next to me, conveniently loaded, I think I'd do it. I dont care if my parents would probably kill themselves too if I did it, I dont care anymore. Fuck them. I can't help but feel that I shouldn't ever reproduce and that the only thing Im good for is being someone else's employee, and otherwise I have to just rightfully perish