Life Isn't that Bad, but Why Does It Feel that Way

I know that life isn't as hard as it seems, and it's really not that bad; however, it feels like it's the worst thing ever. So many things seem to either be going wrong, or just not making sense to me. And if my life isn't the only thing I have to worry or think about, but I have friends who come to me with everything going on with them. I'm grateful that they are able to trust me so much, but at the same time, who do I have to go to about things. I don't really have that friend to just run to about my life. I'm the rock that everyone relies on to be strong and sturdy all the time.