a lot of people play QJ like I JJ

.
Rivercard, I take your point that if A9 and KQ call your JJ there are 3 overcards.......but....this is still ok because you will triple up if it wins.......and you are better than 1 in 3 so you still have odds in your favour, but yes, any situation where you go into a hand less than 50% is risky.
For me, and just my opinion, this is even more reason to push hard and drop at least one of them.