Algebra 2 is a junior class right? I took it as a sophomore. You need help, and you should get it. Algebra 2 is a precursor to pre-calc/calculus. My sister is struggling with calc right now because her Algebra 1 and 2 teachers didn't cover any of the basics so I pretty much had to teach her myself.
this is good too. Part of the reason I had trouble (well, it was video so that makes it more difficult) was that the teacher was a mumbly, grumpy Korea veteran who spent too much time asking students to repeat their questions. Of course the teacher still actually teaching at the local high school also taught my mom and she and others did not think he was a good teacher and learned pretty much nothing there too. Lose-lose.
If you are having trouble, definitely ask for help. I've heard Khan Academy is a really great resource if you want to look around on your own a bit.