scared for calculus.. is it as hard as ppl say 💔

I’m starting a calculus class next week, it’s going to be night school 2 days a week 6-9pm and I’m so worried we’re going to cover a lot of material in one day and it won’t stick in my head since it’s 3 hour classes. I’m teaching myself the basics everyday leading until then hopefully I can finish a full unit before my first class I’m just so worried I’ll fall behind. I love math but I’m not so good at it :( has anyone finished this class already can share opinion?