It's very normal for most women to feel this way after losing their virginity. Unfortunately, these feelings won't go away easily and it will probably take a few more men in your life before you can completely let go of those insecurities.
You can perhaps try to focus on the other things in your relationship other than the sex you have with him, and that may help you appreciate that he may have chosen you for different reasons.
Remember you are in the current relationship hopefully so let the ex be the ex and enjoy what you're waking-up to, if it's any good!(lol).
My guess is that you don't give yourself much praise and you are probably way too young to be worrying about how you feel about your first-timer.
Í can promise you that after a few more men, you will look back at this and laugh at how trivial these feelings were.
It's only if you are in your tenth relationship and still feeling jealous and insecure that you should seriously consider calling Dr Phil.
Otherwise, you are not alone.
And maybe you are watching too many soap operas as sometimes life does imitate art and vice versa.
Go enjoy your life. Work on the things that you're good at and spend time with confident and supportive girlfriends. Good luck!