4 Things I've Learned from Doctor Who

This one is a bit more serious, just a heads up.☺️

Childishness doesn't necessarily mean that you're not mature: This is proven by the mere existence of the Doctor. There's even a couple quotes for that.

Jo: “Doctor, stop being so childish.”

The Third Doctor: “What's wrong with being childish? I like being childish.”

Sarah: "You're being childish!"

The Fourth Doctor: “Well, of course I'm being childish! There's no point being grown-up if you can't be childish sometimes.”

And I know from personal experience that being childish and mature is possible... because I'm just that.

Weird is cool: We all know that the Doctor is cool, and we all know that he's weird. Heck, he's the definition of weird. He's impossible. But he proves the fact that weird is definitely okay. Don't be ashamed of your “weirdness” because that's what makes you... well... you!

Craig: “Has anybody ever told you that you're a bit weird?”

The Eleventh Doctor: “They never really stop.”

We may lose friends, but that doesn't mean there isn't a chance for new ones: We've seen the Doctor loose so many companions, whom he considered his very dear friends. There have been times where he just wanted to give up (as proven in The Snowmen and in the specials that followed after Journey's End). There's always a chance for redemption in friendships, even if it means making new ones.

It's okay to be optimistic, even in really bad circumstances: So many times have we seen the Doctor in bad circumstances. Yes, there have been times where he wasn't that optimistic because of one thing or another. But, at most times, he's fairly optimistic about it all. He makes jokes in the middle even, just to lighten the mood.

The Eleventh Doctor: “My experience is that there is, you know, surprisingly always hope.”