How can I overcome my fears?

How do you deal with your fears? I have a fear of other people dying or of myself and others getting a disease. My imagination runs wild with these thoughts, and it's hard to control these worries. I'm always thinking "what if." My friends tell me not to worry unless it actually happens. I know this is true and good advice, but I find it hard to stop worrying. If you could give me some tips on how to control my imagination, it would be much appreciated.


How can I stop being so emotionally sensitive?

As a 21 year old, I recognize that I'm far from being completely emotionally developed. But, I also recognize that I'm way behind others my age. I think I am too emotionally sensitive. Things people say or do really affect me. Whether I care about the person or not, I always have extreme emotional episodes after others express their feelings or opinions about me. If what they express is derogatory, I get very upset. If it's positive, I get very happy. And, I absolutely cannot deal with rejection. I want to be able to just ignore what others think and just deal with what I think. How can I achieve that goal?


Are other drinks besides water still hydrating?

I frequently hear that beverages with caffeine or alcohol are not good for replenishing fluids and preventing dehydration. But in reality aren't they just a bit less effective at hydrating your body than other beverages? In other words, if you were stuck in the desert with nothing to drink but beer, coffee and cola, would you actually be worse off and die of thirst sooner if you drank these beverages versus not drinking anything at all?