I'm Confused As To When I Lost My Virginity. When

I'm confused as to when I lost my virginity. When I was 16 I had a brief encounter with my boyfriend where he was starting to push inside my vagina but stopped because we had no protection. Maybe the head of his penis was in or a little more. I wiped a tad bit of blood. We broke up. A year later I had another sexual experience with boy # 2 and went all the way. It hurt and I believe I bled after that too although I don't remember. So is it boyfriend 1 or 2 who I lost it to? Also if it's boy #1 does that mean he lost his virginity to me too even though it wasn't full penetration?