watched a CrashCourse philosophy video for fun

well there's your first mistake. CC is consistently terrible but that's for another time.

My thought process is like no matter what I do everything is determined therefore why should I live.

You may be confusing determinism and fatalism. But even we grant some sort of extreme fatalism, I think you just need to shift your thinking about it. If we take the sort of fatalist position of "since the beginning of the universe it was known at exactly x time you would do this and nothing else", there's almost a kind of beauty to it. Aspects of your life that you may think were just freak accidents were always determined to happen. Your birth wasn't just some lucky accident, it was written and fated that you, as you are, would be born at the exact same time in the laws of the universe (whether there's any deeper significance is obviously debatable).

But even then, there are plenty of reasons to think fatalism is wrong. Hell there are plenty of renowned philosophers who think determinism is wrong. I wouldn't fret about this too much (and take the naive determinism of some redditors and youtubers with a grain of salt. You're better off reading actual philosophers and texts).