You will always have a chance to ctb, but once you are dead there is no way to undo that. It is never too late to die, death awaits us all. A lot of our fears are irrational, and if you find yourself in a situation that is too much for you to handle, you can ctb then. Give yourself another year, try college. I have managed to go through college, even though I had a personality disorder, severe social anxiety and thought about ctb quite a lot. If things are really hopeless after that first year, ctb then, but do not go without even trying. Confidence comes through experience, through testing your strength, facing challenges. If you fail, there is always the option of ctb.