1. do not ever have sex with someone without protection.
2. it's too soon for you to associate the lump under your arm with an STD.
3. you say you're not sure how you feel about him not using the condum and you're worried about an STD? that's confusing.
4. every female that he's ever used it with, you've had sex with them now. cells shed and whatever they had, you'll have.
5. if you're luckier than most, they will not have had anything infectious.
6. how old are you?????????