I’ve already thought about, and I think this may have been posted on here before. Honestly I doubt this could be in your head, especially if you’re young, because I could honestly get erections before I even knew what sex was. While I was on propecia, I had trouble believing this was happening to me if anything.
Not only that but I’ve felt pains in my genitals and testicles, also my semen has and still looks kinda weird, not to mention mine and many other’s abnormal hormone profiles.
There’s no shot this is in my head, arousal is something that I can’t control, I used to get erections not even thinking about sex, and sometimes even the slightest mention of something sexual or even something as simple as a girl sitting close to me could get me aroused and hard, as a matter of fact I still feel these feelings, they’ve just been heavily weakened and are inadequate. Man I used to be one horny bastard!
I suggest you backtrack and look through the older posts on this forum, you might learn a thing or two.
Not only that but I think Mew may have told you this before but you might wanna try to get a blood test for your hormones.
I wish you the best and I’m sure you’ll be able to beat this thing, personally I’ve noticed quite a bit of improvement in the last 2 or 3 weeks. It might take a while, and for some it takes longer than others, but I believe that for 98% of people on here it’s really not permanent, and if it is you probably have some problems unrelated to finasteride.
Best wishes and good luck!