I, at the time, considered myself mature at 18. I wish I'd had your nouse and world view at that age. You'll do great.
Best of luck with the resit and enjoy your travels. Honestly the travelling will be a great experience too, and if you ever...
Happy Birthday to @Pejic300 - have a very special day with you family & friends - from all the GOT ;) sorry for the delay got the wrong pejic user listed last night - doh :)