Vets(although the schooling is long and expensive, there's always a need for exotic vets, and grants and scholarships exist)
Zoological studies.
Researcher in wild animal studies.
Domestic animal management
Fish and Wildlife divisions
Humane Society work
Humane Pest animal removal
Fisheries work
Desk jobs exist in all these fields and unless you're determined you could end up working at some world renowned zoo doing paperwork for how many candy bars are bought out of your vending machines. It's all up to you what you end up doing. Don't hesitate to take a less appealing job to make money while you work towards that job you've decided on. Pay checks are great no matter whether they come from McDonald's or the Columbus Zoo. I've done a lot in life, but I've always worked hard for my moneys.
If you decide to go to school, jump through enough hoops and you'll get grants to pay for it. They exist for anyone, you just have to do work to fill out everything to apply for them.
Go for it.