I'm depressed...I think...?!

I'm depressed because I feel alone in this world. I feel like no one gets me, like no one understands.
I don't talk much, most of the time I'm kinda passive because I do all the listening. This doesn't mean I don't have an opinion of my own. When I speak it feels as though no one understands.

Like there was this time at school when I was asking my teacher for something. He just looks at with this blank stare, almost like he didn't understand me, so I made my voice louder and asked him again. But I still got the blank stare. Another classmate who was standing next to me asked him for the samething and he immediately got it.
I feel as though I'm speaking another language.

When I'm with people, I feel sick. I feel akward, like an outcast. It frustrates me. All I want to do is isolate myself. I don't want to be like this forever (and by this, I mean alone) but I can't escape that awkward sick feeling I feel around most people. I don't even know if what I'm describing is depression. Because if it were depression it wouldn't have been like this my whole life.

It's almost like I'm dead or maybe I feel as though the people around me are. I want to connect with people, not just with whats on the surface but I actually want to connect with whats on the inside. I want people to want to connect with me.
General conversations that people have at school feel so cold to me. I feel as though everone is trying to impress eachother. All of their conversations are about "me, me, me, me..." but ironically I feel as though I learned nothing about the person.

People say I'm too complex, that I think too much, that I'm boring, that I need to just let loose, but I don't know how. What is "letting loose"? Doing what you want to do? But I am doing what I want but people don't get it. Saying what you want? But I do say what I want but no one understands.

Is there something wrong with me or is there something wrong with everyone else?
Am I too naive or am I too mature?
Will things ever change?