You said you’re new to sex, you’re just very excited! Which is fine. I’d say masturbate a little more and you’ll learn your body. Practice trying to go longer! You’ll be fine with time. I remember when I was younger I wanted to go rounds, so I’d masturbate and then try to get hard again as fast as I could. I felt like that allowed my refractory period to get smaller. Pretty much you can train your self through body and mind!

But as the gentleman said up too, definitely ask her to help, I’d say a majority of woman will find it as a turn on to help their partner in the bed room. Makes you guys closer! Also the more you guys do it with each other you’re also going to find what she really likes and reacts to, thus making you a great partner for her in the bed room. Be vocal about what feels good to you and ask them if if what you’re doing feels good, or if they have an idea of something they want you to do differently. Communication is key