For the love of god, all this obsession with the "cherry popping"! First off, "cherry" is a
slang term for a woman's hymen. The hymen is a thin covering of skin over the entrance to a woman's vagina, ie it's on the outside of the body.
Hymens come in all kinds: sometimes the skin can almost completely cover the entrance, with only a few holes or slits for menstrual fluids to leak through. Other women have almost no hymen from birth. Personally, I have almost no hymen, and have been like that since birth.
You can find out what kind of hymen you have by holding a miror in front of yourself while lying in bed or on the bathroom floor; you can also tell by touch. I'd say that since none of your sexual encounters have been particularly painful, that you were born with a hymen that is very open, or even nonexistant.
this is totally normal.
"popping the cherry" is a reference to when the man's penis rips (ow!) through the hymen in order to enter the vagina. You bleed because of this... That is if your hymen breaks. But as I said, if your hymen is open or basically unobstructive, then chances are he's not going to break it, and save you some pain!
When you felt your second boyfriend hit someting, if it was inside of you and it felt good, then he was either hittin your g-spot (which is an area of skin inside the vagina that is packed with extra touch-receptors) or you were simply feeling him hitting against the wall of your vagina.
On to virginity: because his penis was inside your vagina,
you are no longer a virgin. It's that simple. Stop obsessing about the freakin "cherry popping". Many young women these days don't have hymens! We are evolving out of needing them, perhaps.