IRS states that I owe over $6000 in taxes for not filing my Lyft taxes in 2018, how can that be when I just made a little over$2400
Did you fill out Schedule C for it? The IRS gets your gross income from Lyft but doesn't know your expenses. You need to add Schedule C.
How to amend but the 2018 link doesn't seem to work
https://ttlc.intuit.com/community/amending/help/how-to-amend-change-or-correct-a-return-you-already-filed/00/25588