18 and too many relationships?

Erin • 21. Mama to a baby boy 💙
I broke up with my boyfriend of 9 months and I feel like at 18 I've already had too many boyfriends. I've had 2 serious relationships but some 'flings' in between. Including the 2 serious boyfriends, 4 boys have met my little brother (who is like a son to me) and it makes me feel guilty that they've met him and I haven't stayed with the guys. 
idk, how many boyfriends is too many? 
and will it put boys off?