We get emotional over stories and shows: We connect with the characters, the events, and the emotions in shows and movies and books like they are real, and that we personally know the characters. Not all of us may cry over it, but we sure do connect with it. Not only does this show a certain degree of empathy, but also understanding and compassion.
We analyze posts, plot lines, and character development: Heck, sometimes we analyze so deeply that we could write a book about a single post. Dedication and intelligence, damn right I find it awesome.
Writing fan fiction, fan art, and edits: Talent and creativity. Maybe not all of us do this, but the fact that we appreciate it means a lot too and says a lot about ourselves.
'Outside world' posts: We get excited about new scientific discoveries. We make connections between events in real life and fandoms and headcanons. We are at awe over beautiful posts on tumblr about that guy who saved that dog's life by jumping into the river. We support charities, causes, and emphasize over disasters happening on another part of the world. We range from being absolutely fascinated to heartbroken to inspired. Does that say a lot? I think that says a lot.
We stick to our fandoms like family: No kidding, we are loyal to our fandoms. We get emotionally involved, super excited, super enthusiastic, heck we jump around in our seats typing nonsense because we are so excited about something in our fandom that will happen months from now. Family don't end with blood. Damn right it doesn't. Fandom is family.
We appreciate things: Random facts about pirates or dead bodies or parallel universes? We don't dismiss them as stupid or weird, we analyze them and grin over them and sometimes even write stories over them. We appreciate intelligence too. When we see a 5 paragraph long analyzation of a gifset of our OTP or a quote from an episode we don't judge, we applaud it. When we see someone going batshit insane crazily excited over an episode or an event, we don't stare at them, we fucking fangirl with them.
Sure some of us are pretty fucked up, some more than others. Sure the world may be pretty fucked up. Sure there may be a certain amount of fucked up things on this site. But there are some good things too. Some awesome things. Things we do on a day to day basis that we don't really think about. Some of us may do some of these things, some of us may not, but we all have something we can appreciate about this site, about ourselves, and about the fandoms we are in. Heck, this list doesn't even begin to cover it. Buddy, don't be so down on yourself. YOU, are damn awesome.
You say Tumblr and fandoms like it's a bad thing. But honestly, it's the best thing there is.