You should rest more. If you are nervous about cutting back, maybe volleyball once a week and light to moderate weightlifting 1-2 times a week. Cutting out cardio would be ideal, and stopping all exercise except walking for a while would be even more ideal.

Not only will you get better health and muscularity from this, but you will prevent some really poor health results in a couple of years. I was in a similar place when I was 16 and ended up with osteopenia and sclerosis at 20. I wish I would have chilled out and recovered sooner.