"now is the most important." - I agree...
we can not change the events that have already happened but we can control our future base on our present act.
people might see changes and consider you for what is your doing or acting right now and not for what you've done in the past. I mean, for instance, they may set aside their doubt in you (for being a liar) for a while if you start showing your sincerity to them.
:)