I expected as much. Once you get to the swamps, use the first iron to make the iron-banded shield. Kill at least two abominations for the root armor. Mask first for poison resistance, chest next for the important pierce resistance. Deathsquitos should be no more of a problem then.

Good food is of course always a requirement.

Edit: A few survival tips for you:
https://steamcommunity.com/app/892970/discussions/0/5144805327259514367/