How to not think of sad things though.

I'm not sure about how things are in Asian cultures. For a temporary thing, if I find myself thinking about sad things when I'm alone now and then, I usually just put on some kick-ass songs and play them loud, whether in my house or my car.

If you find that being sad is your normal state of affairs or it happens way too often, as you implied when you said, "I think other people wouldn't want to be around someone sad like me", than I think you might be depressed and should see a therapist. Having some sad times is part of everyone's life, but life should not be sad most of the time. If that is what is happening to you, by all means see someone. Does your country provide affordable counseling for its citizens?

Well, one good way to stop thinking about sad thing is to stop making new posts on a forum crying out your woes once every (other) day or so.

Thanks. Ya it does. It's just that I have some anxiety talking to people I don't know about how I am sad. Do you think that make sense though. I don't know what to do about that. Do you have any advice.

Well, if you can't see a counselor-and I think you should consider it if possible, no pressure-there are places online where you can talk to other people who are in the same boat as you.

I found one-there are others.
https://www.alonelylife.com

There seems to be a lot of people over there in the same boat as you.