I might get into trouble for this...
Marko, you are thirteen years old, and you appear to have access to a lot of different eqipment, including digital.
My advice is to try everything and anything you can.
You should shoot little films, you should shoot big films, you should shoot movie films.
You should try pinholes, you should try photograms, you should try lith film.
You should shoot black and white and colour, print and transparency, panchromatic, orthochromatic and infrared.
If you can, try some of the alternative processes.
You should try old cameras, new cameras, and homemade cameras too.
Go ahead, shoot digital too - try everything.
Don't just dabble, or flit from medium to medium. Approach the search carefully, and with the goal of learning as much as you can about the choices available, and the choices that appeal to you.
Be open to any experience that may give you insight and joy. If you get more insight and joy from strictly digital work, I'd be surprised, as would most of us on APUG, but so be it.
If you are open to all alternatives, and pursue this exploration carefully, and seriously, you will most likely find what you are looking for. Just remember, if it turns out to be digital, we don't want to hear about it here.
Have fun with your search.
Matt