Should I keep worrying about my future or lay back and relax since it's still a while?

so I'm 13 and I'm stressed out about my future. like what i want to be, i'm trying to plan it out and it's stressing me out. my mom said only time will tell and i need to focus on NOW and not later because i can change my mind. i've been really stressed. like the high school i'm going to, what i want to be, all that. what do YOU think? :(