Scuba diving is a great experience. It is challenging but it is a fantastic way to see a world not normally available to us.
As a young diver, there are multiple levels of diving. There is the PADI Seal certification, and the Open Water certification certification.
If you are a child between 10 and 11 years old, and you have passed your PADI Open Water, you can swim with an instructor or a certified parent. The deepest you can dive is up to 12 meters. If you are 12 to 14 years old you can dive up to 18 meters deep with a certified adult.
You can read more about the PADI qualifications for juniors here: PADI certification