You are WAY
too young to be having sex.
He is not going to go out with you. He has made that clear.
He just wants to **** you.
You will likely be forgotten afterwards. Sorry, but we see this a lot.
If you are okay with that, then recognize that you need to take reasonable precautions, just like us adult types do.
If taking precautions is too difficult or embarrassing for you, then you're not ready to have sex.