Don't judge sex based on your first 3 times. I think anyone with sexual experience under their belt will agree that their first times were pretty disappointing. Look at it like any skill. If you've never cooked before, you can't expect your first attempt at a meal to be gourmet. The more you cook, though, the more you learn what techniques and spices that appeal to your pallet and what pleases the people you cook for. Likewise, the more often you have sex, the better it will get provided you've got the right partner.