Re: I need advice advice Please!
You have no reason to blame yourself for masturbating too much as a youth. It probably only helps penile development. And indeed insufficient masturbating in youth is what's more often associated with any ill health effect (slightly increased risk of prostate cancer in old age). Daily masturbating is healthy. It's only unhealthy in excess, or if hygiene is neglected in the process, or if it's damaging tissue from excessive friction.
There are a lot of things that can cause premature ejaculation (PE), and it can happen for no identifiable reason at all or for apparently psychogenic (mental) factors.
There are a number of irritations and inflammations of various genital organs that can cause it. And they're all easily treatable. Another easily treatable and common cause of PE is just a simple infection. The causative infection can be anywhere in the urogenital tract (prostate, bladder, kidney, urethra). The infection can apparently interfere with nerve function in the penis by causing mineral imbalance (speculation in a study that showed that premature ejaculation semen has abnormal mineral levels).
So I would definitely get checked by a doctor for an infection (and to see what else might be the problem). And you might possibly want to insist to be tested for infection rather than just accept an exam test negative (if there are no other obvious causes remaining), because infection would be such an easy solution to treat (just get a prescription for an antibiotic or anti-fungal).
Should it be irritation or infection, you might also consider whether to avoid certain foods that make you prone to getting whatever sort of irritation/infection it is. (For example, in my youth I once found a horrible brand of tobacco that gave me a bladder infection within about 12 hours every time I smoked it.)
I hope this helps!