why does the kings gambit, evans gambit, vienna and other e4 openings are not played most of the times in a master games??instead its always 1.d4 1.c4 or maybe ruy lopez or petroff is played...I'm so confused, is there something bad about those openings?

Too well analysed;very little space for new 'wrinkles' to surprise opponents?

There is nothing "bad" about these opening for those rated below 2300-2400. And why worry about if Masters play these openings? You are not a master and 99.99 % of the people on this site are not masters.  All of these openings are good for amateurs (like you and me).  

Mad pawn sait it correct....

A very ingenious master can play these openings but I suspect that he can't do it with success consistently and in the long run. As was said before, there are still surprises in these well-known openings but not so many that a prepared opponent would be caught off guard game after game to the ingenious master's advantage.

Ive seen some great games from 2200-2300 players in the Bishops opening, Vienna etc..

Im guessing thought that they were a Ruy player who didnt like a certain line that came up for their opponent when they Db searched, so they threw a changeup.

went to 1850 corr. on here with the bird opening, and the openings you mentioned are better, so at 1550 there should be no problem

and as for the evans Kasparov used it in the WCC a while back with success, so its very playable

The strongest players will usually only use the rarer openings as a surprise weapon.  The exception perhaps was Kasparov's reinvigorating the Scotch for his last match with Karpov, it's first appearance in a WC match in 100 years.  It's frequency today is directly attributable to that.

The main reason these openings aren't seen often at the highest levels is that they don't work against well-prepared opponents, and at the upper levels everyone is well prepared. 

For amateurs, the King's Gambit, etc., can be quite effective.  They are not seen so often, and the opponents are less likely to be ready for them.  The main thing is to be sure the positions resulting from any opening are comfortable for you to play.  If you understand the ideas and like the positions you will get, there is no reason not to play an opening, no matter what the "theoretical" verdict on it may be.