Can't finger myself ?

Im 17 and a virgin and ive always played with my clit when I masterbate and never fingered myself. I can use a tampon just fine but the couple times I've put a finger or two up there I felt light headed/feel like throwing up afterwards. I don't know why I get freaked out like that. I want to try something new while masterbating and feel what its like to finger myself but I just feel sick when I try. Does anyone else had/have this problem and does anyone have tips on how to relax a bit or if something's wrong with me? ..Thanks!