Does this mean that I am crazy?

I feel like i am going crazy. About three years ago. I lost my mom to lung cancer. She was diagnoses with it towards the end of my junior year in high-school and she had a very difficult battle with it during my senior year. She passed away in February, close to my graduation. I dont think i've been the same since. I find myself staring at things and not thinking anything by it. I went to college and ended up daring this guy that i thought i could confide in. He was a liar and a cheater and wasnt supportive. He was very manipulative and emotionally abusive. I broke up with him during the summer and though i felt it was the right decision...i still found myself in my room all summer just staring at my walls, hopelessly. I've been showing some signs of depression...not wanting to hang out or do anything, disinterested in things that i used to truly love, feeling really insecure about everything. I have momemnts where im extremely happy and the other extremely sad and aware of my insecurities. On top of that, my dad and grandmother are sick as well and i always tend to think of the worst