http://en.wikipedia.org/wiki/Hepatitis_C
Is the question about hepatitis C, or about AIDS? This is a forum for hepatitis C, which is not typically transmitted sexually.
Can you ask a parent, teacher, or adult you trust? If you are not sure about the safety of sexual activity, maybe it would be a good idea not to engage in sex until you are knowledgeable enough about sexually transmitted diseases that you can protect yourself. Some of these diseases can be deadly.
Good times come and go. Your health, or lack of it, can be enduring. Stay healthy!