How/when am I going to know what I want to do with my life?

i know many people just say that you’ll find your own niche in this world and you’ll know from childhood or some beautiful experience what it is meant for you to spend your life doing, but i feel like i have never and will never figure this out. i have a few very deep passions (photography and writing) that are both very important to me, i do very often, people say i have talent for, and i spend much of my time/money on. ideally, i would like to go to college and major in one of these, but what do i do after that? is it that i have outlandish aspirations or just that i’m not motivated enough? i refuse to accept that i may just end up living a mediocre life, stuck in the town i was raised in with some shitty normal job, but i’m not sure how else it’ll turn out.