How can I be a better photographer/?

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I wouldn't expect you to be great as a youngster & your images reflect that. The majority show exposure, focus & compositional issues - none are above the standard of a snapshot.

HOWEVER, having said that, do not despair!! You are young & have plenty of time ahead of you to learn, and practice the basics of photography - exposure, lighting & composition. Everyone had to start somewhere.

If you put the time & effort into learning photography (and it will take a few years), anybody has the potential to become good. Being professional (ie making money from it) depends on your skill level plus marketing plus luck & talent. The first two are learnable - the last two, well - who knows?