Boyfriend and losing my virginity

When it comes to sexual activities with guys, I've been with four, all of whom I gave blowjobs to. I feel bad about them as I wasn't in a relationship for any of them but we were heading in that direction if that makes sense. Anyway, I am still a virgin and don't feel comfortable losing my virginity without being in a relationship first but I feel like guys don't see me in that way, how can I get them to? And how do I know if the guy is the right one?