First, you don't seem to understand how a site like this works. Our goal is to help the OP with their problems, not just to give a direct answer to a direct question. Sometimes the nature of the question requires an indirect answer. This is one of those times.
As someone else said, the anonymity offered by a site like this, tends to preclude being terrified to ask.
To the OP (who by the way has posted 2 questions and never returned for followup).
NO ONE should be engaging in sexual intercourse until they are financially, emotionally and physically ready to have a child. At 15, you are not financially ready, from your post, you are not emotionally ready and at 15 you may not be physically ready.
Also from your other post. If this is the soon to be 18 year old, it would be illegal for you to have sex with him. There was a recent case in Georgia of a teen sentenced to 10 yrs in prison for having consensual oral sex with a 15 yr old.