I'm unhappy that my friend doesn't talk to me
That feels very sad. Why do you think they no longer speak to you?
I don't know. I'm too stupid to understand why that makes me unhappy
I know you're upset, there are friends that I have lost contact with over the years, but just try and think that they maybe too busy or really occupied with their lives and it's a normal thing for humans to experience. Try to focus instead with friends and family members who can speak to you and maybe be happy with people who are willing to spend time with you instead.
I'm going to make a facebook event telling everyone that I'm having a tough time in order to get them to respond to me.
You're free to do that, but if you continue to have a tough time I suggest that you seek professional opinion on what you may be experiencing. I don't know if you're being depressed, but I suggest that you figure things out.