Attitude and behavior evaluation

So recently I've been thinking a lot about stuff. I'm the type of person that likes to think about a lot (and by a lot, I mean a lot) of stuff. Sometimes I find it weird when I see adults, such as teachers and parents, when they lecture us they look really mature, wise, and adult-like which makes us stare in awe as if they know everything. (Not.) Okay this is just a personal thought but it's been wandering my mind lately.

But then, say, when it's recess or lunch, I go to the teacher's office and then find that teacher who just lectured in front of class, joking around with other teachers like teenagers. Not like there's anything wrong with that, I understand that teachers are humans too and it's completely normal to do that. I'm okay with that, but what's bugging me is that when they're hanging out with their colleagues they look so very immature, I'd say. For once, they forget that they're teachers; adults with a huge amount of responsibilities, then gossip around and laugh like a bunch of highschoolers. I'm quite surprised, actually. I'd be perfectly fine if I see other girls in my age doing that, but seeing teachers in an age group of 25-35 joking around like high school kids? Well that obviously means that despite their mature appearance in front of class, they're still immature deep down.

Okay, well, who am I to judge? I'm just a 16 year-old high school girl. And I don't mean anything bad, either. I have full respect for all of my teachers at school, I even get along well with some of them. I'm not demanding that all adults should be mature all the time. But based on this issue I'm bringing up, I think we can all evaluate ourselves. I kept wondering why and how some adults manage to get through many years of their life yet still having an immature attitude that just doesn't fit their age, when they're supposed to be wiser because they went through a lot more than us. But later on I realized that age doesn't relate with maturity. Someone can be 10 years old but have a wiser mind than a 20 year-old. Life experience is what shapes our maturity and develops our mind.

But even so, I think we should all start to be more mature. We should all start behaving exactly like our age. We should stop our immature act, because we're not children anymore. Whether you're a teenager or an adult, we all have our own responsibilities. Get rid of your ego and start thinking about what you can do for others. The world doesn't owe you anything, you owe the world something. Focus on reaching your dreams and goals. Control your thoughts and your attitude toward others. But most importantly, your thoughts. Because your thoughts can control and consume you. Stop doing useless things and do other useful stuff.