Will this pass, how can I shake this?

Hey everyone, i'll keep this quick. I'm 19 ill turn 20 soon, i'm currently out of college, took a year off to figure out what i want to do. I go to college in Missouri b/c that's where I always lived, my parents moved to Tennessee. At the end of this summer, I moved back to stay with them until next year, after about a week I started to feel "off" not peppy as usual, my first thought was, oh I'm depressed. After that first thought, I haven't been able to stop thinking that i may be depressed or have depression, it's been about 5 months now, and I feel fine mostly , but I still feel "off". For the first 4 months here I just sat at home all day, nothing to do in this big house. which gave me way too much thinking time, i think it made me feel worse, that and i don't really have friends here. I now have a fulltime job, and i feel better, like purposeful. I always feel better when i'm engaged in work or conversation, but as soon as i'm not my rumination about depression begins, idk its like i'm scared of it, and my brain wont stop thinking about it. I;m not sure whats going on, I don't think i'm depressed, and my family and people work say im too happy to be depressed, my head and body ache a lot, i saw my doctor and we decided to do blood tests to see if anythings off, i have another appointment to go over the results next. I feel fine mostly, but my mind won't quit thinking about the word depression, and that bothers me. I also dream an awfully lot. I find it easy to smile, laugh, and focus when i'm engaged in activity. I even sing and hum a lot , but i still feel off and different since i've been here. thoughts?