Loafrath: At 19 , you should readily hold an erection without manual stimulation. I don’t want to sound critical of you in any way and most of us at TP are not qualified to go into “doctoring”. Notice your join date—so, you have been around for awhile. Do you think you have temporarily stressed your blood return veins (so-called veinous leakage), by faulty jelqing or other PE?
If the problem is a question of general health, you should answer to whether you are very overweight? Lacking exercise? Drinking an excess of vaso-constrictors (coffee, tea, cokes, Mountain Dew, taking certain perscription meds.)?
I am reading an excellent book, reviewed by Twatteaser on this forum, called “4-hour Body” byT. Ferriss. I think I would have been thankful if someone had put it into my hands, when 19. There are several excellent regimens in the book for getting in a super, health state fast without much concommit bullshit. Other plusses like how to give your mate a fifteen minute orgasm, are streamed in there along with getting muscled up etc. Cost about $14, new, $11, used at Amazon.