Once you have chosen which door you want opened, there will, in fact, be more on the other side. It might be twenty years before you get to the next door, or it might be three. When my dad first gripped the handle that would lead to his life as an undergraduate student, it was a realisation that this door was never closed, it was simply one that he had never tried to open before.
I thought this year, my first year spent being in my twenties, I should try some things I've always wanted to do but never got round to doing. I feel like I should do something with my life other than my university work or nurse a hangover over the weekend but, also, to borrow from the words of so many others, to try and make the most of being young.