whenever I worry about something and ruminate about it, I try to put things into perspective- the things I was worried about this time last year (or whenever) are not relevant anymore or whatever I was worried about happening never even happened. Look to the future, one day when you're at uni/doing an apprenticeship or whatever you choose you will have this all behind you! Most of the time, the things we worry about never amount to much and they really aren't worth stressing over in the first place, so give yourself a break!