What should I do if I've recently given up and don't know how to feel?
Why have you given up?
I'd rather not talk about that, please move on.
It's completely fine to feel confused or down, but if you really have given up then you should talk to someone. Giving up on life is a sign of depression and is something to be taken seriously. Talking to a therapist can potentially help you with your feelings and make you feel better.
I talked to my doctor but I think it's just my version of self-destructive behaviour. So I will let this topic die down already.
That's good that you're willing to speak with a doctor, and you should continue having these conversations. It is wrong to just give up entirely and you'll regret it later on in life.