Yea i would also recommend against that. Not being able to perform because of nerves is bashful and cute, but whiskey dick is just commonplace dirtbaggery.
Look, don't overthink it too much. My body count isn't particularly high, but my stroke game is one of the few things I have absolute confidence in, and I still get nervous as fuck during initial sexual encounters. It's strange and exciting and weird in a good way, but if you communicate honestly you'll be fine. The first time I slept with my last girlfriend I was in the exact scenario you're describing, and I told her I hadn't gotten laid in a while and she said she was too, which was reassuring and assuaged the anxiety a lot and everything went great
Also, the solution to nervous spaghettidick is pretty simple, just give head until the problem resolves itself, and if it doesn't, as long you do a good job she probably won't be too bothered
