I encountered it once before when me and this girl were in my car and she grabbed my penis but I noticed it was barely hard, though we were just making out. I did notice marks from the precum but nothing else. The next time we were in the car and making out, undressing and this time I took my pants off and I was hard but not 100% even though I wanted to be. She gave me a blowjob but I never came as I just never got the urge to. Now I’m worried and assuming it might just be nerves. I also masturbate but I didn’t assume this would cause an my problems. Wondering what the reason may be for this and if it is just nerves causing it.