Forgiveness

So my boyfriend and I have both been raised Catholic and I love him beyond measure. (I’m 17 and he’s 16 -Both juniors in HS) We’ve only been dating for 2 months - but we’ve known each other for 2 years prior to us dating. I was wondering what sexual actions are considered a sin and if we need to ask for Gods forgiveness (note we are both virgins and are waiting till marriage for sex, but we have made out and I want to please him in any way I can, so where should I stop?) what would be considered too far/a sin? Besides Sex of course. I’m sorry if this is a weird question but I just need clarification