I masturbate normally, but when it comes to foreplay I can't have an erection.. I tried viagra and cialis but nothing helps.. I'm only 18, do you have any advices or I should visit the doctor.. what doctor someone should visit when it comes to this? I gues its only a psychological problem

It means you may not be as ready for sex as you think you are.

It may also be that you are too used to masturbating and are not used to being aroused with another person. The mind can shut the body down if it feels insecure or uncomfortable. Give yourself some more time and take it slowly. Don't try to have sex just because everyone else is or you think it is the thing to do. Make certain you are really ready for intercourse and any possible consequences. Location, concerns about being over-heard or interrupted, disease, pregnancy, performance anxiety, etc. can all affect how ready you are mentally to have sex.

Another factor can be who you are trying to have intercourse with. Many people, male and female, find that they have to love and care about the person they are with for sex. There is a lot more to sex/making love than slot A and tab B fitting together. It may be that you and your partner need to spend more time becoming comfortable with each other on non-sexual levels before attempting intercourse.

At the risk of sounding parental, how did you get prescription drugs without visiting a doctor? I wasn't aware that they are available over-the-counter. Understand that these medications should not be used by anyone who doesn't know what the actual problem is or if they could make the condition worse. They are medications and can have very serious side-effects.

If you are worried and think it would help your mind calm down, do see a doctor. Start with your general practitioner. He/she can decide if you need referral to a psychologist or a urologist.