why do I feel like that?

[kketchupp]

So, everytime someone asks me if I'd like to hang out or something I mostly say no.
But then when I see and hear about how fun everyone has and they go out and do things. I feel really sad and lonely..
I want to be alone but I don't want to feel lonely and I don't know what to do?

[Saldav]

Your depressed cause that's exactly how I feel. See your doctor to rule out any medical problems.