"...try to do little positive things for the people around me" doesn't necessarily imply doing anything to positively impact the future. In fact, spreading awareness of the future consequences of present actions can often be viewed as being negative by those who would rather remain in the present and just 'be happy'. But it could, and I assume that is what you intended. I also am aware of the need to strike a balance, which requires judgement.

"It is not necessary to have hope in order to persevere."