I don’t know why I would like to staybe alone. I don’t know why I would like to be alone.

This is grammatically correct, but maybe you meant to say "I know why I like to be alone" or "I don't know why I like to be alone?

It is because I don’t have enough energy to hang out with so many people,; besides I think doing thatso is meaningless. It is because I don’t have enough energy to hang out with so many people; besides I think doing so is meaningless.

Life is short, so we should do things meaningful things. Life is short, so we should do meaningful things.

Hanging out, chatting, drinking are the kind of things that are ridiculous in my opinion. Hanging out, chatting, drinking are the kind of things that are ridiculous in my opinion.

When I stay'm alone, I can do things I like, and the things I do all have positive meanings. When I'm alone, I can do things I like, and the things I do all have positive meanings.

I study every day, and I make progress every day. I study every day, and I make progress every day.

You can also say, "I study and make progress every day".

It makes me feel really satisfied. It makes me feel really satisfied.

I study, and I enjoy it. I study, and I enjoy it.