If I didn't file taxes in 2018 due to misinformation (I was told I didn't need to file my summer research grant reported on a 1099-misc), can I file now & waive penalty?

This advice was given to me by a tax expert through my parents, but a few months later I was nervous and searched the web for answers. I think I may owe taxes but I haven't received any bills from the IRS so I'm not sure what to do now.