I reside primarily in a small town and do virtually all of my animal rights work online.
You don’t have to work directly in your community to have an effect on your community.
The work you do online will eventually end up reaching your community, plus many other communities.
As @Styna mentioned, you can do work though social networking sites.
I’ve been able to have a positive effect on a very large number of people just through YouTube video comments, forum comments and comments below news articles, blogs, etc.

You could put up posters, or ask local libraries, shops etc. to put them up.
You could give out leaflets outside relevant places e.g. McCruelty ones outside a McDonald’s, anti-fur ones outside a shop selling fur etc.
You could write letters to companies about their inhumane practices and polices, or send emails.

No matter what your situation, you can make a difference for sure. I’m actually homeschooled myself and live in a small suburb, and I can tell you that it doesn’t narrow down your options– in fact, it makes more opportunities! I’m able to spend more time during the day helping animals than students who go to school are able to.

You can organize protests, leaflet on public property, spread the word to your friends, and do social media activism. You CAN make a difference! Do not give up. Let your mom know that you are not worshiping animals, but only trying to create a better world for them.

lol so by not wanting to brutally rape, torture, and murder these other living beings, we are worshiping them? That’s one I haven’t heard before. Kudos to your mum for originality.
There is always online activism
Speak up through social networking.

I live in a (very small) city, and I want to do something to bring attention to animal cruelty/going vegetarian-vegan. But I can’t think of anything I can really do. My mom doesn’t exactly approve of all the animal liberism type stuff…she refers to it as “worshiping animals” and she doesn’t listen. So I’m homeschooled, by the way. Which narrows my oppertunities further. I really want to help out in my community with this, but I don’t know what I can do.