Here's a sign that yes, everyone is as insecure as you. Pretty much all of us are convinced NO ONE is attracted to us.
A new study tested whether people could tell if someone was flirting with them or not.
Only 36% of men and 18% of women could actually tell when someone was flirting with them. BUT . . . 80% of both men and women could tell when someone WASN'T flirting with them.
In other words, most of the time when we interact with someone, we're all pretty sure they DON'T want to get in our pants . . . even if they do.