@w2-confused
If your 1099-NEC is more than $432, you will owe self employment (social security & medicare) tax, even if your total income is so low that you owe no income tax. So, you still have to file.
Although not impossible, it's very highly unusual for there to be amount in boxes 3-6 of your W-2 and box 1 to be blank. It is not unusual for box 2 to be blank, that's very common. You really need to understand (have an explanation for) this. Amounts and code numbers in box 12 may explain it.
Yes, you will have to mail your return.
