This upcoming september i'm going to be a junior but unfortunately, i'm not going to be taking any AP classes. I don't know what to do. So i was wondering if i should join a bunch of clubs i've been interested in.
Any suggestions on what i can do?

By junior year, I would of already had clubs I would be committed to and stayed in them. But there is always the option of studying harder for your other classes to up that GPA.

I agree with MaiAndy. You shouldn't join random clubs--you should stay in clubs that you're committed to. Make sure those clubs are significant because in some college applications, you'll get the opportunity to write about them. In short, it's more important to be committed to a small number of significant clubs than to be in 10 random clubs you don't play an important role in.

Is there any reason why you decided not to take any AP classes?

I wouldn't suggest joining many clubs, but rather joining the few that you really feel you can get something out of. Colleges value leadership and accomplishments over basic participation or membership.

Since you will be a Junior, you will still have roughly 2 years of your high school career left. That's plenty of time to find one or even a few clubs that you can be passionate about and really do something in.

By the way, you can always do some online research for after-school programs, jobs and internships. You can pursue your current interests through those and get some experience in the field.

I wouldn't say that joining clubs your junior year is the worst thing you could do. If there are a couple of clubs that you have wanted to join, I say go for it.