Circumcision is a painful practice, and your doctor will probably discourage you from having it done for that reason.
Premature ejaculation is pretty common among teenagers, and you shouldn't be embarrassed by it. That probably usually disappears on its own in time.
If your problem is the fact that your foreskin is too tight and you even have problems to put it back, circumsiciom is the last option. There are alternatives, like an steroids cream. Talk to your doctor and he/she will give you one of those treatments. You will have to apply on your retracted foreskin for three months and after that time, maybe no further treatment is needed.
All the best.