Depression or just confused?

I am at a wits end with myself. I can't tell if i'm just confused because i'm at a crossroads, or if i'm depressed and making myself isolated subconsciously. The background is this, I was in a relationship, an unhealthy one at that, for about 3 years. I lived with my ex and long story short, he used to verbally abuse me and right before I moved in with him I had a huge falling out with my best friends I had grown up with. I was completely reliant on the friends of his that I had befriended and my ex boyfriend for support. As I mentioned before he was NOT at all supportive and i began to rely heavily on drugs. I eventually got rid of him and only smoke weed now to help me relax. When I broke up with my ex I stopped talking to everyone we knew in common for fear that he would stalk me if he knew anything about where i was. I've since met a new man but have not regained friends from the incident. I talk to my friends on myspace/facebook, but anytime old friends want to meet up or my boyfriend wants to do something with people, even though I want to, I ALWAYS find a reason to be negative about going and hanging out or even getting out of having to hang out with people entirely. It is even spilling to my family life and i'm finding myself more and more unattached from my family. My life besides this, is great. I have a nice job, i bought a home a year ago, ive got a new car...I just dont understand why i'm like this. I used to LOVE hanging out with people and now I dont know if its my 'older' personality that doesnt like to hang out or if im truly depressed and need to see a doctor. I'm just so confused....is anyone else like this or am I just crazy??