> When I did volunteer work at a kindergarten for children with disabilities, I played with one autistic child. The boy was very timid. So, I should treat him attentively and suppress the sympathy that I felt a lot of for him, in order to do not hurt his delicate mind.

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When I did volunteer work at a kindergarten for children with disabilities, I played with one autistic child.

This sentence is correct.

The boy was very timid.

This sentence is correct.

So, I should treat him attentively and suppress the sympathy that I felt a lot of for him, in order to do not hurt his delicate mind.

I should treat him attentively and suppress the sympathy that I feel for him in order to not hurt his delicate mind.

Instead of saying 'in order to do not...' you can simply say 'in order to not...' Make sure to arrange the words properly. Avoid starting your sentence with "so" It would be better to put the second and the third sentences together.

The boy was very timid that I see the need to treat him attentively and to suppress my sympathy for him, in order to not hurt his delicate mind.