First time

Ok so basically me and my bf are thinking about doing it for the first time we are both virgins and have done other things just we haven’t gone all the way yet and I just want to know what to expect also we are both 15.

We have both talked about it for awhile and done so much research we already have protection (condoms and lube so it isn’t to painful) and have already figured out a plan for if the condom breaks and all that but still I’m nervous