Hi Dana,
Your problem isn't a new one by any means! The good news is that you are starting in RE at a young age. Wish I would have! The not so good news is that lending can be a little more tricky now than it used to be. Getting your credit score higher will help for sure, plus a larger down payment than you currently have saved. Here is a link to a blog that I have subscribed to that will help you a great deal. It is actually the blog that made me aware of Bigger Pocket's existence! This particular link is all about increasing your credit score.
http://www.goodfinancialcents.com/build-your-credit/
Here are some other tips that I think you should do, but there are more than 1 way to skin a cat, as they say:
First, you need to get in touch with a mortgage lender (or several!) and get the nitty gritties of what you are going to need for traditional financing, if that is the route you choose. Get educated first!
Next, are you currently working while going to school? Is the $3,500 the only savings you have or do you have personal savings and this $3,500 is just for real estate investing? (If it is the only savings you have, I would suggest not investing at all until you have a much bigger personal emergency fund for yourself. Then, on top of that, I would have an emergency fund for your investing too because things can and do go wrong. Trust me on that one!)
Third, if the traditional lending routes cannot help you right now due to your low credit score, lack of capital, and student loan debt, start searching on this BP site to learn about how to invest when you have lack of capital.....like using hard money lenders, for example.
Good luck and keep us posted on how it goes!