I'm "mixed."
Father's side: Austrian and Croatian (which probably means there's some Turkish and even Celtic in there.)
Mother's side: Ahhh, here's the rub. Spanish and Native American which is often misnomered into "Mexican" but "Mexican" is a country it is not a race. I knew a German guy who was born and raised in Mexico and called himself Mexican.
My mother died when I was young so I was raised by my step-mom who was 1st generation Italian. I look Italian (probably the Croatian in me) and as I grew up that way everyone tends to think I am. I even kinda Identify that way although I'm careful and say I'm Italian by osmosis. I know more about being Italian than i do about being Austrian, Croatian or "Mexican."
Because I don't look it, I usually don't say I'm "Mexican" and avail myself of the white privilege I grew up with because of the Austrian/Croatian being predominant in my skin make up (although I used to tan like crazy so I'm not lily white).
However, now that I'm an older fart if someone I've known for a while decides to get all bigoted around me about Mexicans I wait for the right moment, tell them I didn't know they felt about me that way and walk away.
I do not tolerate in any form any bigotry.
Usually when asked for "race" on official forms I put "other - mixed" and leave it at that. If it's a medical form i do go into more depth because certain ethnicities have different medical issues.
I'm happy with all my ethnicities jumbled up in me. There are many wonderful (and not so wonderful) things about our cultural heritages to learn if we wish.
As far as learning languages go... you can always learn them. As individuals we have no control on how we came to be. But we do have control on what we become.