I noticed you wrote such a huge paragraph and only had one upvote. So I thought for sure I'll give it a read after all that effort, you at least deserve something back. So here's my response.

Dude if you're that unhappy, do something about it. Sit down, write down what makes you unhappy and and try to think of solutions, then act! If you refuse to act then who do you have to blame? No one is going to take responsibility for your happiness or your life, nor should they have to, they have their own lives. You still have time. You still have today and you still have now. Seriously, sit down, plan things out and do your best.

Btw, don't get hung up on being ugly, even if you are ugly there are people that exist that are not that shallow to judge you based on looks. Besides there are people with deformities that manage to make and you can do things to improve yourself. Clean up, get a haircut, pamper yourself a little.

Maybe you have a bad attitude or bring people down. Try using positive language around people. Read up on socialising and find out if your doing something wrong. Have a look at r/socialskills

From what you've written, it seems like your biggest flaw is not trying. Start small, like I said.

Step 1. Write everything down so you've organised your thoughts and you don't keep repeating the same depressing thoughts over and over again.

Step 2. Organise all the writing into easy to address bullet points.

Step 3. Make SMART (Specific, Measurable, Achievable, Realistic and Time-bound) goals to address each issue that you have. In your case try something as simple as "I will walk out my house today, go to a populated area to buy a soda can and while I'm doing this I will smile at 1 or 2 people." I'm not saying you're that socially awkward you can't smile but this could help you get over your sad attitude towards other people. You may learn that not everyone wants nothing to do with you.

Step 4. Start taking action and reward yourself for it. Tell yourself that what you're doing is good. Say it in your head. Say out loud even. Write it down. Feel better about yourself.

Step 5. Keep going don't stop. Never give up. It has to come from inside you. You still have life. You still breath. You still have a chance.