please proofread my introduction thanks?

There are many obstacles that impact our lives emotionally ,physically and in humans also behaviorally.

Despite the fact that problems may not be easy to overcome, one's behaviors impact one’s life and also one’s environment.

David has overcome many obstacles and that impacted his life significantly. Like by having his right leg amputated after finding a cancer tumor,now not only has he to live with the new disability but also accept the fact that his leg is no more the same as it used to be before.

Besides this,now his foster parents and he himself are facing difficulties in changing their behaviors.

Hence,we can clearly see that object relations theory plays a key role in understanding the cases of people like David and his parents and also helping them change their behaviors.

If David has a single parent,you may refer to her as a foster mother or him as a foster father.Then you may replace parents with either of the two mentioned above, as per which ever is applicable.

First sentence- There are many obstacles that impact our lives emotionally, physically and, in humans, behaviorally.

Second sentence- you might want to cite the quote

Third sentence- Regardless of how difficult problems can be to overcome, the behaviors we express impact our lives and environments.

Fourth sentence- (you may want to introduce who David is, I an not sure who your audience is) For example, David has overcome many obstacles that impacted his life significantly including the amputation of his right leg after doctors found a cancerous tumor.

Fifth sentence- Does he only have one parent? Could you call them his adopted mother or father or by the person's name? -- Besides having to adapt to his new disability, David and his adopted parent face many obstacles as they try to change their behaviors.

Sixth sentence- As a result, object relations theory has played a key role in the understanding of and help to David and his parent.

Good luck, hope that helps!