It sucks but school basically always matters and there's nothing you can do about it but work your ass off if that's what you need to do.
At least if you're planning to attend college, and if you aren't you'd better have a damn good idea what you're gonna do with your life if you want to end up comfortable.
Like I just got my grades back for this semester of college and I got all A's but I was still pretty paranoid about how they were going to turn out.
And studying well and enjoying high school are not mutually exclusive, either. There were only a few guys at my school who actually did both but a bunch of the girls did plenty of honors classes and sports and got good grades and had fun and they ended up going where they wanted to go.
If you need extracurriculars and you don't want to do sports try the math team. It's actually pretty fun and doesn't take up too much time.
idk, maybe I'm being preachy
just take stuff seriously, most people don't get to succeed without trying