No. From the U.S. Government's perspective, there's no issue holding other citizenships. But when you travel to the U.S., you are supposed to present your U.S. passport not your foreign passport.

They cannot deny access to US citizens, which you are.

But... I hope you have been filing yearly taxes in the US...

I don't think I earn enough to be filing taxes in the US and there is an earned income threshold around $100k which I'm well below.

I don't think the US recognizes "dual citizenship" - as in they dont care, not they force you to give up a citizenship.

Once you have a US passport you are a US citizen, end of story. Doesn't matter which other passports you hold. You can't be denied entry into the US.

Get up to date with your taxes.