I get it, old enough to want and deserve some privacy and independence, not old enough to manage everything quite as an adult would.
It was hard enough to figure out what my own hair wants and needs, I imagine it's even harder in your situation, so good luck!
I don't know where your hair journey took you, so maybe this is something you already know. But for me the key bit was figuring out the porosity of my hair. I used to think it was mostly about my hair being very fine, but the most relevant key to finding the right products is that it's very low porosity.
This might be a stupid suggestion, but I have had habits and techniques I just never questioned – if this is a regular problem and not just some few items (some zippers are just shitty, I get that), have you tried changing your technique? Like pulling the end of the zipper down until it's under a bit of tension with one hand and then pulling the actual zipper thingy away from the flap while closing the zipper with the other hand. That usually works for me.