You would still have the same age, gender, personality, skin color, etc. and you would be able to speak at least one local language and would know basic information of the era and place. Your family, social standing, and such would be randomly picked.
Yeah, antibiotics is a big one. Plus, some of my skills might actually still be useful in the 40s.
But life did suck in a lot of places for a lot of people in the 40s. WW2, the devastation left behind by WW2, and horrible social attitudes. Good luck in ‘the west’ if you’re not a straight white cis man.