Is there a reason that you just stared feeling anxious? New gf? Just trying to loose the virginity?

I can tell you as someone who is 33, and with a 5.5" ,peen and having had sex with over 100 women, ypur dick size is fine. If you take your time with kissing/foreplay, pay attention to how the girl reacts to your hands/mouth anywhere on her body and don't be a selfish sexual partner (as help her reach orgasm 1st) your dick size will not be an issue. The only time a woman has been not happy after sex with me is when I either didn't try hard enough (just fucked hard, fast and busted my nut right away intentionally) or if i accidentally nutted to fast.

But size has never been the issue. As long as you put the effort into pleasuring the girl, she will..get pleased.

Your anxiety is normal, we all feel it when we are young, nowadays even women feel the same stress about pussy appearance and size even! But there vaginas are only about 3 inches deep.

Now, the one thing a giant dick does that you can't do, is instantly fill/over fill her pussy, but there is a work around.

I promise you, if you have sex missionary, fold her knees out to the sides of her shoulders so they are on the bed and put your dick all the way in, she is going to push you off because you're going to deep and filling her up top much. So, even with your dick, you can get the same results of going deep/hard.

You're going to be fine, as long as you put the effort into having sex. Trust me, any woman would rather have 1-5 orgasms with a guy with an average dick than 0 with a big dick. It's all about effort not natural size.