no se si todavia soy virgen o no

hi my name is chelsey i went to a party yesterday. i drunk tequila. i remember that we were dancing and all of the sudden i woke up at bobby's house ( he's the guy that i've been dating since two days ago.) when i woke up he wasnt there no more. he had gone to work. when i woke up i had all my clohtes on but the problem is that i was wearing a skirt. i asked him if something happened and he said no. i asked my friends and they said that he took me into a room during the party. he said that its because i said i wanted to go to sleep. i dont know if i should believe him or not. how do i know if im still a virgin or not??? what do you feel after you lose your virginity??? please help me im afraid that i did it when i was drunk and without protection.