Welcome to Thunders toasty. Listen to sparkyx, it is all so true! Do not make the same mistake like i did in the past. I have been afraid of having sex just because of my dicksize which has been completly stupid as i found out later. Your size is more than enough to please a girl. So enjoy and have a great time with that girl. Sounds like she is nice, no reason at all to worry my friend.
Have fun!!!