Could any of these symptoms be related to some kind of depression?

Let me just say that I am planning on speaking with a counselor when I get back to school.

Recently, I have been experiencing some very strange feelings. Mostly it is over-reactive worrying. If I call a friend and he/she doesn’t pick, I immediately think it’s because he/she got into a car accident or is in the hospital. If someone doesn’t return a text or isn’t online when they usually are, I imagine the worst and worry about it until that person gets back to me. It is entirely possible that this is just stress because I am home (and my mother and I don’t do too well living together) and I don’t have nearly as much to occupy me as when I’m at school so I over-think these things. Monday was my 20th birthday and all I could think for most of the day was how old I’m getting. I know that 20 is most certainly not an old age. Does this sound like it could be some kind of depression or simply stress?

I’m also asking specifically about depression because my mother went through some low-grade depression a few years ago so I know it’s in the family.