Cryptorchidism is underdeveloped or undescended testicles. You will need to go and be checked out by a doctor as this can cause impotence and other problems. If you think it could be this, I would urge you to do it sooner rather than later.
There is often a tendency in families so it might be worth asking if other males in your family have suffered from this. It is usually caused by the muscles and ligaments connected to the testicles being too tight.
It is pretty straightforward to fix and should not have any long-term implications for you.
Is there any signs that i could see to know if i have this? and would this cause my voice to not crakc and my penis not to fully grow?