Is 22 credits way to much for a semester? Can't decide.?

A typical college semester is 12-15 credits. You also have to keep in mind that for every cl you take you must spend time outside of the cl studying and doing homework. If you're taking 17 credits now and you aren't happy with your grades, why would you think that your grades would be better (or even the same) taking even MORE credits? I think you should cut your load down to 12-15 credits for a semester and see how that works for you. 22 strikes me as way too much for any but the most exceptional students and even for them I think it would be a stretch.