Does sex only feel painless in one position for you?

Ma
I recently lost my virginity, a few days ago and me and my boyfriend go numerous rounds, but his penis only seems to slide in easily and pain free for me, doggy style/ on my stomach. We tried missionary and it's very uncomfortable for me, and it never goes in. At the same time though, I want to be able to see him and kiss him while we make love. Is anyone else going through this as well?! 

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