Kylee: I'm sorry that it sounds like this is something that you didn't necessarily want in the way it happened (or when or so fast), but just felt like it got away from you. I do want to check in to make sure that you actually consented to all of this, though, because it sounds like you may not have. You say this person got his hand in your pants, for instance, rather than you asked him to or that he asked and you said yes to doing that. Was all or any of this actually sexual activity you wanted and consented to? I get you say some of it felt like it kind of just happened for you, but it sounds like it wouldn't have without this guy steering things the way he did. In other words, it probably for sure wasn't something he was surprised by or not thinking would happen, and I just want to make sure that he did ask for your consent with all of these things and that you also gave it to him.
It's okay if it was something you totally wanted and said yes to (because you wanted to be doing it, even if it all felt fast), by the way, and doesn't make you stupid. What it may just make you is inexperienced in doing things like knowing how to slow things down when you're liking a thing, how to insist a partner use a condom and to talk about STIs and birth control, and with someone you probably don't feel that confident with. It's hard to know what to expect and what you need to be ready sometimes, and if you're with someone who is either equally inexperienced or who is experienced but doesn't seem to bring any care, maturity or skills to the table in their interactions with you -- like having condoms and putting them on as a habit -- on top of walking in pretty blind and without expectations of anything sexual....well, it's easy to see how a lot of people land in this position. Especially when those people are young women and the other people are older dudes.
I'm afraid it is too late now for emergency contraception, so at this point, yep, what you can do is just make plans for STI testing -- after all, pregnancy wasn't the only risk here -- and then, if needed, pregnancy testing.
With the pregnancy test, you'll just want to wait and see if your period comes when expected, if you are pretty regular. If it doesn't show up by around a week after you expected it to show up at latest, then you can take a test and be assured of accurate results. With the STI testing, I'd suggest you plan to go get that in about six weeks to two months, unless anything seems like it's gone off in the meantime (like your genitals smelling way weirder than usual, or funky-looking discharges or sores), in which case you'll want to schedule an appointment if and when any of that happens. You can also ask for a pregnancy test at the same time you get that STI testing if you want and it's needed. Do you know where to get that kind of healthcare near you?