To reiterate what others have said, you
can never lose your virginity to yourself
or to a toy. If you have not had sex with
another person, then you are still a
virgin.
Your future partner will not be able to
tell if you have had sex or masturbated.
Masturbation and sex don't really change
your body.
As for hymens, most girls break them long
before they ever have sex anyway. Most
hymens are broken in childhood or early
puberty due to masturbation, tampons, or
running and jumping. It often does not
hurt or bleed when the hymen tears, so
some girls have no idea when it actually
happened. That's ok though. The hymen
does not actually do anything. It is just
a piece of skin that is leftover from when
you were still developing in the womb.
Hymens have nothing to do with virginity.
Like I said, most girls tear them when
they are still virgins. On the other
hand, a few women have really tough hymens
that don't tear at all, even after they
have had sex. Some girls are also born
without one.
For more information on the hymen:
http://www.coolnurse.com/hyme
n.htm
For more general sex and masturbation
information:
http://www.coolnurse
.com/sex_faqs_index.htm