OP, you’re asking questions for which answers can be found easily. Look at the Common App and you’ll see how it’s asked. The most straightforward is to mark Hispanic and white, (assuming your Euro identity is white.) Adcoms don’t look at both and decide you aren’t enough of one because youre mixed. (NHRP is a separate program, with its own criteria.)
But many adcoms will look to see how you’re involved.
Don’t just go on what hs friends think. They probably know only hearsay.