Would this turn a girl off, or would she understand?

im 19 (male) and i just got out of a nasty relationship with my ex, it was both of our faults i guess but she was being really nasty and i found out that she really only cares for what suits her she would still use me if she had the chance. But anyway this girl took my V card (she had with like 7 guys by that point) and she made me think i wasnt so great at , not because of size but probably because i wasnt so sensual but you gotta remember i was a virgin and all she ever did was lay there and just wanted me to do everything. so now im just nervous that when i get with another girl that i wont know exactly what im doing. Now my question is (say i was about to have with a different girl for the first time) during if i said something to the girl like "i know it sounds stupid but i just want to let you know that im a little nervous because i havent had alot of experience before" would this turn her off or would she understand and just try to show you what she likes. please i really need to know