Normally, there should be a difference between wearing a condom and not wearing one. In general, if you wear a condom, you will last longer.
Now, some guys last longer because they have more experience in this department, and they need more stimulation before reaching orgasm. You're young, this is kinda new to you, so it's normal to be super excited and reach orgasm quicker.
Also, sex is not just about banging like rabbits non-stop. Most men will cvm in 5-10 mins or less of continuous, fast, penetration. Correct me if i'm wrong guys.
So yeah, apply all the tips you got in here, and you will last longer for sure.
And hey, you know that you're allowed to go for round 2 and 3 if you want
And it's almost guaranteed that you will last longer and longer after each orgasm.