My federal taxes are set as Married Filing Jointly but I'm a minor. What do I do?

I am a minor and the HR department messed up my federal taxes by setting it to Married Filing Jointly instead of Single. While my state and city taxes are at Single. They said I don't have anything to worry about since I'm a minor and I only made less than 500 last year and because of that I don't plan to file. They have set it back to Single but I am still worried that I have not paid my taxes correctly. Is there anything I need to worry about?