whats wrong on sending btc twice or many times from same address , someone told me that the publickey point which starts with 04 is shown while transacting and thats bad for security of the account
You got bad information, or you misunderstood it.
There is nothing wrong with sending bitcoins from the same address more than once. However, there is a privacy issue with
receiving bitcoins at the same address more than once. And, generally the only way to send bitcoins from the same address more than once is to receive them at that address more than once, or to have the change returned to the sending address (which is the same as receiving it more than once).
A public key that begins with
04[//tt] is an uncompressed public key. There are no security issues with using uncompressed public keys.