"結局、他人が思っている自分にならないのは不可能です"

Simplified Meaning:

When people around you think of you in a certain way, their beliefs can start to influence how you see yourself and how you act. For example, if everyone around you tells you that you are really good at sports, you might start to believe it and put more effort into being better at sports. Over time, you start to become the athletic person they say you are because you believe in it too. This idea works in other ways too, like if people always call you lazy, you might begin to act lazy because that's what you think they expect. To apply this to your life, try surrounding yourself with people who see the best in you and believe in your abilities. When they think positively about you, it can help you to also think positively about yourself and push you to become even better. Likewise, be mindful of how your thoughts and words about others might influence their own self-perception. If you consistently encourage and support someone, your beliefs can help them achieve their best too.