I feel so empty when everything is fine.
Have you ever had a good time with someone?
Yea, I hung out with my ex-girlfriend. This made me realize that I can't stand hanging out with people anymore.
If you are consistently feeling numb and empty, that is a sign of depression. You should speak with a therapist to get the help and support that you need in order to start feeling well again. Mental health is no joke and requires just as much care as your physical health.
It's fine. I'm just being moody.
Even if you are being moody, it doesn't hurt to get help and support. A therapist could definitely help.