Would it be big enough for you or not?

I'm 18, a virgin, and not too sure what to think about my size. It's 6.25" long and 5.75" girth. My length is just at the "average" size according to some sites I've checked, but my girth is pretty more than average according to tge same sites. Please be honest to what your reaction would be to it and if you think it would be large enough to do the trick and have a good time. I just need to know what to expect for my first time which is gonna be really soon with my gf, but I just need to find out cuz if it's not that impressive to girls then I need to get some pointers on performing oral on her;). Please be honest and don't tell me not to worry about it!!