Don’t get discouraged! I was the same way. Personally, the beginning of Alg II is a review, which is easy. Once you get more into quadrics, matrices, etc. then it can get tricky and harder. Practice and go to tutoring if you can. I think all of the above commenters are spot on with their replies. They gave you great advice and resources. Khan Academy is a great resource it helped me during Alg I.