My girlfriend and I recently started having sex and so far we've had a few problems: 1. I have an 8.5 inch penis and she is about 5'4... as a result shes very small and I'm very big so I'm hurting her. 2. Due to her being so tight (or maybe my own fault) I get a whole lot of stimulation from trying to push into her and I usually don't last very long at all. 3. I must be nervous or something because I'll be hard as a rock before but as soon as we start positioning for sex I soften some to about 70%. This makes me bend and such when I'm trying to get into her and since she is so tight it definitely isn't helping anything. Anything I can do about these things?