My pronunciation of "TION"

One of my English teacher point out my pronunciation of "TION", such as station and condition. According to him, I say, kind of "shone". I practice this pronunciation repeatedly, but once I start conversation, I say "shone" unconsciously. In addition, I say con of condition "cone". So my pronunciation of condition is "CONEDISHONE".

I need to repeat these right pronunciations over and over again.