Is it worth it?

There are days where I wake up and I ask myself: is everything I do and feel worth it?
Sometimes I would say 'yes' and other times I wouldn't know the answer. Is it because I'm depressed? or it's just the way my mind works. I say that I have no idea but deep down, I know that it could be both. I'm not the most happiest person alive, there are days where I would gladly sulk and say I hate this life and all of its bullshit. Then, there are those days where I feel happy with myself. I feel contented with what I do, with what I have accomplished. But there are days where I am genuinely happy but something goes off in my mind that triggers that little sadness in me; and I am unbearable to be around. I was told that is how my mind works, that I will always be mildly depressed. I have learned to live with that fact but I still wake up thinking asking if everything is worth it.
I like to think that life is worth living, I know it is