Does this mean my sex drive is low and that I have ed?

I'm never horny and never wake up with morning wood but I masturbate when im bored I have to watch foot fetish porn to get a erection.And it only last like 2 min if I don't touch it and it will go down if I don't constantly jerk it.And also regular porn doesn't turn me on anymore when I was like 14 I would get so hard it would actually hurt.But when I turned 16 I could only keep it with stimulation.But yesterday this phat butt girl walked in front of me and while she was walking her butt was jigglin and I got a erection.Do I have ED.I also was diagnosed with a 5mm pituitary micro adenoma.I'm also 20 years old.