I'm mixed as well. Indian/Welsh/with like 1 percent black
My father is indian and some welsh, and my mothers said is welsh with some irish(really ima mutt lol)
but mostly im indian and welsh. I agree with you on the indians having curly hair.
I foreone never thought of them having pin straight hair. I always just thought they had really straight roots with some curls going down.
That seems to be the case with my grandpa(indian)
even though he has short hair its curled at the end.
idk but before i relaxed my hair i figure it was a 3a/3b