Long Term VS Short Term Investment

I used to believe in long-term investment. That is, I buy a stock and hold the stock for several years. I got this idea mainly from books written about Warren Buffet, such as "The Warren Buffett Way".

Now, I find I am getting a little bit impatient. Thinking about waiting for 1 year or two to turn $100 into $120 makes me sick. It is interesting to know that by being committed to long-term investment, Warren Buffett consistently beats the market. Warren Buffett can accurately predict whether a company will do well in the next 5 or 10 years and he also knows that what price is a bargain price for that company. The problem is most of us don't have the capability. Probably that's why some people hold a losing/boring stock for years and still do not know whether their position will generate positive return or not.

So I would rather save the trouble by doing short-term prediction. I think I am doing quite well up to now :)