Being fired does not make a person a loser. When all is said and done, the only person who can make you feel like a loser is you. And, if you are doing that, you are going to undercut your chances of ever finding a job.
If you talk to people at any level of an organization, from company presidents on down, many have been fired at one time or another. And, most will say that it was the best thing that could have happened to them.
As for what you should write on an application blank, let the truth be your guide. You can still describe the situation in the context of all of your successes on the job, and you can even generally note how the job changed as a result of a change in leadership. However, do not make negative comments about your former boss or the company itself.
Rather than dwelling on the termination itself, let the potential employer see how much you have learned and grown as a result of this experience. Most of the people you encounter in a job search are quite understanding about terminations, and you can be sure that a good number of them have experienced exactly what you are going through right now.
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