My penis and balls are constantly shriveled! even when in warm air. what's going on?

Anxiety/Stress: It's normal for some men to have mostly shrinking of the scrotum and penis. It's related to not just heat but anxiety level, stress level, hormone levels etc. Some patients reports shriveling when working out or when stressed. If you are always tensing up your anal sphincter you are likely a bit tense, and that tightening of the sphincter is related to the shriveling.

Poor blood flow: There's probably reduced blood flow to your genital region. If you are not experiencing any difficulties with an erection then this shouldn't be an issue at all