Bad Kisser Boyfriend helpppp?

Okay well i have a boyfriend and we kissed for the first time yesterday and we were sitting down watching a movie and he leaned in on the right side and i wanted to go on the right side but i had to go on the left he put his tounge in my mouth and we started kissing and i backed off because i just wasent in the mood anymore when i backed away there was saliva all over my lip line and i just felt grossed out it was my first kiss and i had no idea what to do or what a bad kisser is? I really need someone to tell me what a bad kisser is? and how to deal with it