Help scared text sex best friend JUST LISTEN TO WHAT I HAVE TO SAY?!

Okay so me and my best friend were hanging out and we were walking down the sidewalk and saw one of those sewer holes or whatever were open, so we went to check it out and my friend fell inside and got knocked out, I was trying to think of a way to help him out, then my girlfriend texted me telling me that tonight she wanted to finally have sex. So I texted her back asking, are you sure you're ready? She said yes, so I went to the store, it's just across the street, and picked up a condom, *this is my first time* and texted her saying I needed to head home and get a few things, so I went home and was there for about an hour *got stuck eating dinner with the family* I grabbed some spare clothes and took a shower, then put on some axe body spray and texted her saying I was heading over, then my mom caught me sneaking out, so I had to sneak out my window *had to wait like 30 minutes just for my mom to go to sleep* anyway now I'm outside and heading over to my girlfriends house about to lose my virginity, is this the right thing to do? Sneak out behind my parents back and have sex with a girl I've only dated for 2 months? Or should I just text her saying I'm not ready yet and I need a few days to think about it. Please answer ASAP, SHE'S WAITING FOR ME!