How to know if i have high testosterone, what are some personality traits and physical signs?

Check T level: You didn't mention your gender but only true way to determine if your Testosterone level is high is to draw blood. Short of that, if you're wondering, we worry about excess T in someone who exhibits change in mood for worse eg 'roid rage akin to road rage, oily skin, acne, hair loss. If you're male, we worry about gynecomastia & prostate enlargement. In women, we worry about virilization.

Testosterone level: is easy to test for and there are other hormones that need to be tested along w/that one. Please see your doc. He/she can do that and provide and treatment necessary. Low T impacts mood as well as sexual response. Peace and good health.