Hi! I am thinking this as a problem right now. . .by the way I had a history of prone masturbation and now I am able to do it in conventional way thank you for site so here it is now

 

when I felt the urge to masturbate and I usually start stroking with a flaccid penis and goes to erection, but my curious is it takes me 2-3 minutes to get erection with the help of fantasize or thinking erotic in my mind and when I get it up I suddenly lose it and then erect again. . .what I trying to mean is the flow of my erection is "up and down" then when I almost reach climax to orgasm my penis will erect as hard. . .

 

it is normal for a normal male or it is a problem that needed to address? I'm curious about it and it makes me anxious. . .I guess normal during masturbation can get an erection in only 1 mins? please I need advice about it (age 18)