i am facing trouble with my Adword account
Have you added the "Quality Score" column on the "Keywords" page? If so, tell us what your quality scores are. Low quality scores can make clicks more expensive.
Also, where is your bid relative to "Est. First Page Bid" number? You may have to add that column too. There is also a "Est Top page bid", and Est First Position Bid" number, for rankings further up the page. Those three numbers define whether your bidding is really "pretty high".
What is your average ad position? When you say your ad is not on top, how are you determining that?