I make terrible decisions. I feel so worthless and empty. Please help.?

You're going through depression and you have no confidence. The best thing for you to do is to see your doctor and tell him how you are feeling, exactly like you've done here. They'll be able to ess you and see how depressed you are. They'll maybe put you on an anti depressant or something which will help your mood which will in turn help your confidence. Then you'll have the motivation to do things that you want to do and this again will build your confidence. But go soon. You don't want to get any worse and hinder your chances of getting better quicker. Hope this helps :)