I'm a 15 year old girl that has style issues, can I have some advise?

Just try a little bit of eyeliner,waterproof mascara,and some easy to wear liptgloss. The mascara won't smudge even if you leave it on during sports. For your hair try some bangs and maybe even some Layers. Overall I like your style. Maybe try finding some jewelry you like at places like hot topic. Just to spice it up a bit