You are absolutely right @chireerocks, environmental circumstances definitely can lead us to behave out of character. As it has been demonstrated by classical psychological studies.

However, research has also shown that, overall, each individual presents a pattern of cognition, emotions and behavior throughout life. It was precisely upon this observation the concept of personality and its study came to be. Beginning over 2000 ears ago ;)

I wish you all the best!
Have a wonderful weekend.