hi...thanks for writing.. i have understood your concerns.. i feel by lazy erection you mean weak erection or erectile dysfunction.. so, at this age, if you are not married than must be masturbating..masturbation is not a bad habit..but sometimes a person gets used to it..in masturbation you develop a habit of achieving orgasm early because at that time you do not bother about the partner satisfaction or sexual performance..so it is common for a person who masturbates ejaculate early.. erectile dysfunction is due to psychological as well as physical reasons, but at this age it is usually psychological in origin..any kind of anxiety whether related to daily life or sex, it distracts you and bothers you...so that you have to consider.. the fluid you are talking about which comes out on erection is precum. it is prostatic fluid which leaks before proper ejaculation and it does not contain sperms..it is normal physiology, every male person will have that experience..so you need not to worry.. for premature ejaculation, you shud not worry at present..you shud consider it as a problem only after marriage, when it continues..there are behavioral techniques and drugs available which can cure premature ejaculation.. erectile dysfunction is more related to anxiety, so try to control your stress and anxiety..it will help..foreplay is a option to hold erection for long duration.. in my opinion if the problems continue even after marriage, then only you shud consult a psychiatrist and ask for help..this issues are easily managed with counselling and drugs.. i hope this advice will be helpful to you..best luck..