During penetration (with real or simulated parts) the vagina actually changes length, cervical position changes, etc. These changes are normal and natural, and it's exactly what your body is designed to do. Things go back to normal afterwards. Don't even worry about stretching anything out of shape with a dildo. Save that concern for vaginal childbirth.
A guy won't be able to feel any difference. You're still a virgin since you haven't had sex with a person. What gynecologists look for to determine a female's virginity is whether or not the hymen is torn. Some girls are born without a hymen, so... well, sometimes even a gyno can't tell. I'm willing to bet that 99% of guys don't know what a hymen is, nor could they find it. Don't worry about it.
Just keep your toys super clean and have fun solo. I'm a big fan of waiting. I waited until my mid-20s and I'm really glad I did. No regrets or mistakes.
Answered Feb 07, 2012
Edited Feb 07, 2012