лицемер - someone who acts contrary to what they say, usually someone who tries to look good by saying false words.
лицемерить - the verb for that
лицемерие - the instance of the verb's meaning

So, I would say я не лицемер or я лицемерием не занимаюсь but your example needs a bit more context. We don't usually say лицемер to refer to ourselves, usually it is meant to describe someone else. Like он лицемер.

So when we say that we want to say that we won't or don't act contrary to what we say we use phrases like this:

Я говорю правду.
Я от своих слов не отступлюсь
Мои слова не расходятся с делом
Я не отступлюсь от своих слов

and so on.

I hope this will help you