might have sex tommorow for first time. im very nervous the last time this almost happened i couldnt get erect im scared it might happen again. the girls seems nice i told her im a virgin and but i dont think she really belives me and thinks im just joking but i told her im serious. any advice and tips thanks less

I would recommend to not plot it out in your head..like what your going to do, when to make the move etc.- Also, DONT put to much thought into it,like..am I going to be bad,what if she thinks I suck,etc. Its pretty much what they said above..just know when you put to much thought in something it will make you nervous,fumble,and have a harder time enjoying whats natural.
If she already knows then after kissing and foreplay,make a sudle move(whatever your comfortable with) and tell her..if your doing something that she wants done different then to show you what she wants done..every woman is different and it shows your sensitive to her needs.Or tell her to play teacher and student(if shes outgoing). Either way relax...not to much thought,and do what feels natural!And use protection!.Good luck hope your first time is memorable in a good way!! less