Ended up cheating

I was with my ex-boyfriend for a year and a half. I liked him but was not in love with him. I began cheating on him after one year and two months. It felt goed to be with someone else. i felt wanted by men and i felt that i could have whoever i wanted. I ended up cheating on him with 3 guys (who i had sex with), And one guy who i just kissed. I never had any feelings for these people. I ended the relationship with him and ended up sleeping with someone else. I am now in a new relationship and my boyfriend doesnt know about this. Im afraid to tell him. I am in love with him and i think he is the one. He thinks my ex-boyfriend is the only guy i slept with, because he was the first and only one anyone knows about except for my best friend. I've been with my current boyfriend for a while now and i haven't cheated on him and i won't. I just feel bad keeping this from him but he cant know. Im only 16 and ive slept with six guys. I liked it at the time but now i feel terrible and used by the guys i did that with, they all knew i was in a relationship but didnt care. I guess this is something i'll have to take to the grave.