Crt, I've never used a spectrograph for voice training once. Don't freak yourself out over numbers and notes. I listened to your voice samples.. I'm sorry I don't understand Spanish (the New Zealand public school system isn't that great on languages so I never learned any
Your higher sample isn't as bad as you seem to think it is. You are dipping into your chest resonance quite often though. With the humming sample you gave, there's nothing wrong with it at all, Actually the 5th note you hum sounds like a good spot for you. Basically hum that note, you seemed to be pretty comfortable hitting it in the recording. Sit in a chair, with your shoulder straight, and look up at the ceiling so that when you make the note your neck muscles feel tighter around your voice box, hum that same note, and practice till you hit it easily, then open your mouth and say "ahhhhh" at that same pitch. Go though the vowels a,e,i,o,u holding that same note
then try to move to singing words, all just at that one note.
Also, don't worry about people laughing or sounding silly. No one is going to laugh at you, we are all here for the same reason and we all know how hard it can be. I think it's awesome you're training, it took me over almost two years before I was brave enough to even try training. Feel good
you're doing great!
X