>>937630258 (OP)here's some badly typed advice from me:
about taking things seriously, i think as long as youre intent was good, whether you mistook what the person meant or not, it was the right thing to do. if your worried that they're making fun of you, just try not to talk to them, they aren't worth you're time.
about sentimentality in general, i would say that any bad experiences you go through are reasons to grow, what doesn't kill you makes you stronger, and any good experiences are just reminders that you don't need to be sentimental to be happy, the "good old days" that everyone talks about is RIGHT NOW, so just do what makes you happy, like a hobby, and if you enjoy it, you'll become good at it, and then it will be something for life :)