@Emmaaaar18,
I started going gray at about your age.
Hair dye is cheap and easy to use. If you're unsure of things, try temporary or semi-permanent (it will say so on the box). Or have your hairdresser do it, but that gets pricey quickly.
Consider your skin tone and eye color when choosing a color (because it doesn't have to match your original color). I was a kind of strawberry blonde for a long time but when I turned around 50 my skin was paler so more of an ash blonde made sense.
I now go with the lightest blonde they make, and it's helpful in that my roots are a lot closer to white now.
I will eventually stop, I suppose. But this is easy. And it beats the hell out of the steely gray I was getting (and when you've got skin with peach undertones, that looks terrible.
Experiment!