Sometimes I run through imaginary scenarios about how interactions with a therapist would go, and it always ends up with me worrying about them, feeling like I'm overwhelming them with my problems, causing them extra grief when their life probably sucks too, etc. It helps to know good licensed workers should be trained to help the patient avoid feeling like that. I probably would anyway, but that kind of maladaptive thinking is the exact reason I want to try therapy anyway...
I believe high empathy has contributed to some of my difficulties. I've tried therapy a few times before without much luck. Recently I've found a therapist who has helped me immensely. We have a good connection, which is very important. She also uses somatic approaches, with I think is more effective for people who need help working with and processing their emotions. It also seems to be better than standard talk therapy when working with trauma.
Somatic therapy might be helpful for you :) And make sure you feel comfortable and safe with your therapist.