before you go any further, a few questions from the wise....
Does this person you like live close by? Is it a "long distance love afffair"?
Does this person have the same feelings for you, or is it in the "infatuation" stage right now?
Removing the cross contamination issue from the formula, are you able to see and date this person you like, often enough to know what kind of person he is when you're with him?
I only ask these questions, because, without the CF issue, there are a few issues I had experienced, which didn't work out, and it is in reference to a long distance love affair.
I've had, acutally, three long distance affairs, none of which worked! The main problem, and it is especially relevant to why my marriage broke down, was that I never had enough time to date the person before going into the marriage stage.
The other two situations, I was still young, and the problems with those was that I didn't know what they were doing while I was away so far, so the person was either seeing someone else at the same time, or we just eventually broke it off because things weren't working out.
There are a lot of considerations in knowing a person up front, how they talk, the way their body language speaks, and what expressions they have when there is a conversation. Also, how they treat you on a date.
So, if the person lives close by, and because you both are under 18, will your parents support it? Also, there can be a give and take to the phychological health aspect. If things don't turn out and one of you, or both, are infected by cross contamination, you have to ask yourself whether it is worth the risk.
I recommend taking it slow, before going through the risks of cross contamination. Remember, keeping your own good health is priority one! Good Luck with your heart!