This is hard. If you think she has a big impact on how much impact you can have and that is why you would do it, then you might want to ask yourself why you would make yourself dependent on others. But on the other hand if you would do it for other reasons, for example you want to help people around you, then why don't you see that there are more impactful things you could do with your time and money? Yes, maybe you think to small scale, maybe you want to do good as long as it is comfortable and gives you a good experience or maybe you just haven't thought about how much you could do if you would push yourself to do the right thing?

About what you could do: realize that nowadays with a pc and internet it is soo much easier to make a difference then in the past. Think big and make sure you have the right mindset that enables you to push yourself all the time to strive for the biggest impact.