Do I need to file? I heard if you are single and make less than a certain amount, you don't need to file taxes

Is this true. I am 27, and single, I did not make much last year because I was disabled from a car accident. I was not even able to collect disability, the insurance company did not pay out. I had to live off my savings. So I only made money last year for about 6 months, do I still have to do my taxes? If yes, or no, how much must I have made that makes me file taxes, and how much is it to not file taxes? Also, do I have to claim the interest I paid on my home, or is that up to me, and benefits me if I want to use it right?