You can see auras with the naked eye? That's clairvoyant. You also seem to see the future in your dreams, this is also clairvoyance! I've also seen the future in my dreams, only I didn't realize it was the future until it actually happened... go figure. I can also see auras. You can be clairvoyant, but everybody has a little bit of all of them, some might be more strong in clairvoyance though - like you.
Well, one way to make your premonitions seem less scary is to tell yourself that... hmm... What do you tell yourself? The events in them may not be all that great (your brother's murder? Wow! That's gotta be something on your conscious) but the future is the future and everything happens for a reason, at least, what I believe. So while these events happen, they happen for a reason.
I know of people who know their exact death date. And our deaths are all planned out so we get the most out of this life, so it's nothing to be frightened of. If it's any consolation, spirits are taken out of their bodies before they feel any excruciating pain or suffering in death - so your brother is in a safe place now.

Control of your dreams? Maybe if you reinforce your willingness to know/see the -present- in your dreams by consciousness it will shift to the unconsciousness and show in your dreams. Practicing lucid dreaming would also help because you might be able to get to a point to change the direction of the dream before you get a "drop in" of the future.
What kind of psychic are you? Well, I think we're a bit of all of them, but clairvoyance sounds like your strongest suit from what I've heard from you. If you can read auras, it means you can read auras. It means you can more easily see the underlying structure of things, and the people or objects the auras are from.
I can definitely see why the dreams would make you turn cynical and bitter, though, especially if you see bitter and cynical things. Knowing the future can drive you insane, especially if it's frequent, because it would **** the joy out of the present. I know I become bitter and cynical at times, because the absolute structure of things can take away from the mystery, I guess. Maybe. I just know I can be really sarcastic at times. Unpleasantly so! At least to other people.
Anyway, I'll stop ranting. You could ask the universe to grant your wish of taking away your dream premonitions, and when you're ready they will disappear, but personally I think any psychic ability should be nurtured instead of repressed or rejected. But that's just me.