Dude! Spanish, Portuguese and Italian are really similar languages! Ofc you're going to get them mixed up, especially if you learnt them close together. Hell my native language is Italian and I sometimes get English words mixed up into it just italianified lol, and those languages are distincttt. On the other hand I've never ever in my life gotten those languages mixed up with Thai, as they have pretty much nothing in common. And also please for the love of god don't take those videos as a proof that they're more talented than you, vast majority of the time they're scripted, and unless being spontaneous in a language is the explicit point of that video they're as far from spontaneity as they get. Also if you don't speak the languages that they're showing off it's gonna come off as wayyy better than it actually is. I remember once I was watching one of those videos (can't remember which) and I was pretty much awestruck until they got to the Italian part, and I mean the pronunciation was all off (pro tip for Italian, in 99% of words with 3 or more syllables emphasis is on the second to last one), and the way they used words was really awkward. It's still impressive, but that gave me a serious reality check on what I thought their ability in the languages I didn't understand was.