Hi there! Welcome to life as a psion, eh?

Anyhow, all these things are natural, and certainly shouldn't become overwhelming and to the point where you wouldn't want them.
What you need to do, is read about how to shield. If you do that, then that should cut out all these problems. You won't go hearing unwanted thoughts, won't get overwhelmed with everyone's feelings, and should be much happier for it.
Once you do that, you're learn to filter. Filtering can be a good thing.

I learned how to do it, but in truth? After so many years of getting top thoughts of everyone I glance at, and then it all of a sudden being so hushed inside my own head, it was just TOO weird for me. And I went back to being more open again.

So to each their own, huh?
As for knowing when someone's going to die? From what I've read online, it's not one of the more popular gifts, but it's VERY useful, no? Try to think of it that way. I mean, if you know it, and believe in your talent, just think about it as, a last chance to see anyone off. Most people do not have that notice, and feel that there's always something more they wish they could say to that person fore they'd died. You won't have to worry on that. If you know about it coming, then take advantage and let that person know anything you want them to. Soon (if not yet), you'll probably be able to detect sickness in others too. And I don't mean colds, I mean things like hospital worthy. And if it's someone you care about, you can warn them. If it's someone you dislike, just smile.

And, aside from the weird looks? Who cares. Well, most times. My husband tends to get creeped out by me. Between me knowing when death is coming, illness, or finishing everyone's sentences for them. One time, I asked him what a tumor was (as I didn't know), but when he asked why, I told him an online friend of mine had one. I finally got a hold of her and told her, and two days later after a doctors' visit, it turned out to be a tumor. He didn't talk to me for THREE days! That sucked. But honestly? Aside from that, I really don't care what people think or how others feel about me.
I don't wear it on my sleeve (that I have gifts), but I sure get stared at a LOT. It gets annoying and is also funny.
So? If anyone asks, and you feel like telling them anything, just say it's a gift, or, it's a talent I've always had.
I'm pretty sure somewhere here there's how to's on shielding. It's all very easy. Long story short, imagine the strongest material surrounding yourself. Me, I imagine a stone dome surrounding myself, like a castle wall type. Me on the inside, and the stone dome let's NOTHING through. You can get more detailed, but that's about it. And in the beginning, it's best to check on it, and do this a few times a day.
Wish you the best of luck trying to get this under control.