erectile problem related to masturbation style?

hello im 15 years old. i have been masturbating since childhood and since im in adolsecence now i masturbate everyday, even to some excess ( do it 2-3 times a day). the thing is the way i masturbate is different than the normal way. what i do is, i grab the upper part of the skin on my penis while pressing it down. this way, i dont need to be fully erect to masturbate and that gives me the chance to do it whenever i get bored or just slightly aroused, so when i see something even remotely sexual, if im bored, i start masturbating since it doesnt require a full erection. i realise this is unhealthy. this way i come very quickly, in about 15 seconds. when i tried the normal method i couldnt get any satisfaction and it took me so long to come i gave up. but the thing, whenever i get erected now it is soft and is not steady(my penis). what do you think my problem is? should i cut down on masturbation? should i change my masturbation style? start taking medication? all of the above? also, there is another problem which i think might be related to this one. my penis, especially the upper part, begins to ache when i get an erection. have i damaged the tube? i am not willing to go to a urologist. please help!