I see you have changed your mind. I see you have changed. I realize you are different. I can see you are a new person.

Sorry.. it seems a bit strange.. you can't change someone's heart. Can you describe the situation?

In this case 'found' has the meaning of 'realised'. I would guess 'my heart' means 'my feelings'.

You have a change of heart when you change your opinion about something or someone. When this happens we say: I have changed my heart or I changed my heart. You cannot change somebody else's hearth but you can make/help them do it themselves. Example: After our conversation last night I have reconsidered my decision. You have made me change my heart I found could be equivalent to "I discovered" or "I realized"