Considering you're a young person, this is an important topic.
Reconsider the reasons why you would have sex with this girl. Yes, all your friends are doing it but you need to do it for yourself because it's the right thing for YOU not for anyone else, not to impress anyone, not to feel like you're part of the group. Do it for the right reasons. Ask yourself, why would I choose to have sex with this girl?
Well, I promise you, you'll have other opportunities in the future too. There's no rush. Feeling horrible is a very strong emotion. Practice listening to your intuition, it's very rare that intuition is wrong. If you do not feel right deep down inside about doing something, then maybe it's a good thing that you're reconsidering it.
Ultimately, I can only talk about my personal experience so from what I've seen around me (I'm a 23 female) and from my own sexual experiences, I can tell you that starting to have sex will most likely emphasize your craving for sex especially because you're in your teens and simply because hormones and the body want sex around that time of life. It's not like you're going to have sex with that girl and your body's going to stop craving it all of a sudden. Your body will most likely continue to crave sex, just be aware of that. If you choose NOT to have sex, then you will probably continue to crave sex too anyway... The craving will most likely continue in both cases.
Was that a typo? Did you mean that you want to distract yourself from the real work you need to be doing or did you mean that you do not want to distract yourself from it? Because if you meant that you want to distract yourself from the real work you need to be doing, then, once again, reconsider the reasons why you would have sex with her. Trying to distract yourself is not a good enough reason.
You said in another comment "I was just wondering if it was a bad time to get some success sexually that's my core question because I feel bad going to parties and hanging out with my friends for hours not working on myself."
Throughout your whole life, you will want to work on yourself. Self-development and learning are a forever thing, we're always evolving! So should you stop yourself from having sex in 2 years, 5 years, 10 years just because you'll also be working on yourself? No. So no it's not a bad time to start getting some success sexually. Personally, I think the right time to have sex is when you have no doubt about it. You're ready to go all-in and to explore. That's when you'll have no regrets and a positive experience. In the future, it would still be nice to be able to look back and tell yourself that this was an awesome time!
Lastly, the guys here are giving you some tips about building report and making sure that the girl does not know explicitly that you want to have sex with her. All I have to say to that is: remind yourself to take the girl's feelings into consideration and to be genuine. This is what's gonna differentiate you from all the "f boys" vs being a more mature version of yourself. This way of thinking is going to teach you a lot. If she's not a 100% down, forget it. You'll have the best time and the most fun only if the girl is all in as well.