Not sure if I am a dependent. Was a full time student until May + worked part time (non work study). Then I got a salaried job and have been working since mid-May. Help!

I graduated undergrad in May and during that time this year, I worked part time jobs (non-work study). All of my tuition and housing were paid for by student loans in my name with my mom as a co-signer. 

After graduation, I started a salaried job immediately and have gone back and forth between an apartment and my parent's house (but I still pay them rent). Am I dependant? They're trying to get me to amend my tax return.