Contraception is something that you would need to go to a family planning clinic or doctor about. It is not impossible, but unlikely that a young girl would be advised to have the implant. There are many options such as the pill, which your parents do not have to know about. You are young, so it's important to consider if you are ready. Also, you can never be 100% certain your partner has no STIs, even if you do trust him, so condoms are the best form of protection. I'd advise you to speak to your doctor first.