help: over masturbation causing erectile dysfunction at age 17?

hi i am a 17 yr old guy who recently over 3 months ago began experiencing problems with seminal leakage and maintaining an erection while being aroused. when i was with a girl over 3 months ago and we were cuddling up and making out, i noticed that my penis was soft and that a ton of precum was all over my boxers. i have never had any precum before and never had any problems at all regarding erections. i am a virgin, however when i made out with a girl 3 or 4 times months before, i never felt this sexual weakness or problems with erections. anyways since that first happened over 3 months ago, my penis becomes soft, if i make out with a girl or do any kind of foreplay with her for more than 5 minutes my penis goes limp, i feel like i will ejaculate on touch, and i leak a ton of pre cum. this also started to occur whenever i try to masturbate now. i cant get hard at all, i cum way too fast while im still soft, and i still leak pre cum. even when i do get hard my penis isnt as big as it used to be and still doesnt really get up. ive been trying to figure it out why this started occuring and i assume it was over masturbation. i masterbated pretty much every day once or twice regularly or about 10-14 times a week.  however during about a 3 month stretch,i increased masterbating to about 2-3 times a day, i had lfiting in the morning before school and would only get about 5 hours of sleep per night 5 days a week, and smoked marijuana maybe 10-15 times. I looked up many things online and figured that decreasing masturbation, getting better sleep, and stop smoking pot will make my sexual problems go away. lol doing all those things are much easier said than done however. in the past 3 months i have smoked pot 3-4 times, masterbated only 3 times in the past month, and i am getting a lot more hours of sleep per week. however sleeping wise, 3 nights a week i sleep 5 hours before i go to football and the others i sleep 9 or 10 hours at least. anyways whenever i try to masterbate i feel like i will come very fast and i come when im soft. i dont wake up with morning wood often anymore after i usually always had it before. even when i do feel fully hard, my penis is maybe a inch and a half smaller than it was before fully hard. i never felt my masterbation and sleeping patterns were that excessive to cause these problems. also i dont really think smoking pot has much to do with it either. maybe combined all 3 were too much for me. seeing as im 17, i know i shouldnt be dealing with these problems at all. i read online and i have the symptoms of premature ejaculation by having a soft erection, cum easily, and leak out pre cum in enomeous amounts and this causes my penis to go soft. however i dont have any of the extreme symptoms such as lower back pain and testicular pain. im pretty sure that it is over masturbation causing these problems and i am trying to not masturbate anymore.  however i havent rly seen any improvements at all though. i need help and i was wondering if you agree that my over masturbation habits caused this. also i was wondering how long can this take to recover fully if i dont masturbate anymore, rarely smoke pot, and get more sleep? i have little confidence going up and talking to girls anymore because id feel i couldnt do anything anyways. im 17, so buying those herbal supplements are kind of out of the question, and going to the doctor is as well unless i realllly need it.  what kind of natural things, like diet can help me? im a 2 sport athlete and excercise a ton.  sorry for this rambling long post, but i just wanted to get everything in there lol and i was wondering if my erectile dysfunction can be cured and how long it can take to do that naturally?