hi I'm 21 and just recently iv got myself a new girlfriend! our sex life is great and almost everyday up untill I started haveing a few problem with getting an erection all together or my erection going soft in the split sec I reach for the condom!! most of the time now I can't get a hard on no mater wat forplay we do, even though I feel very keen n ready to go my penis will be at it's most limp stage and almost actuly feels like it's going to shrivle up and go back up in side me!! please help me, why can't I get hard any more and why can't I keep it hard!!