you are definitely still a virgin if you have only been penetrated by sex toys.
as for your question about whether or not guys feel the difference between loose or tight, they certainly do. the first & only guy i've slept with was a few years older than me & had obviously been with girls who were experienced, ie not as tight as a virgin. he was practically overwhelmed with how tight i was & commented on it several times during our love making. so tighter is better.
if "tightness" concerns you, you can always exercise your vaginal muscles (i cant really explain this, you just kinda do it) which tones & strengthens the walls of your vagina & therefore gives it a tighter fit.
and when a patential sexual partner asks you about your virginity, be honest about it. you don't have to go into detail, but you ARE still a virgin, so that's all they really need to know.