Wait is this pocket knife for protection or if, say, you were in the countryside?
Is this normal?
I'm 15 as well, but I carry my oyster card, debit card, phone, keys, headphones.
Let me rephrase what I said. Depending on location should have been depending on what I'm carrying. For example, if I'm doing a photoshoot, I carry the knife because I have hundreds of dollars of gear on me, and if someone happened to try to rob me, I have the knife there to use if the need arises. I have started to make a habit out of carrying it in places that it is allowed legally, so basically anywhere but school. It can be used as a tool also, to pry things.
Now that I have my learners, I also carry my wallet with that, my debit card, and a few other cards in it. Don't carry headphones unless it's to school. My school bag has my MacBook, charger, Magic Mouse, calculator, pens & pencils, various papers for class, a notebook, headphones, and sometimes my cameras.