Fighting with Depression

I know everybody has their own heavy things on their back and sometimes it can sound like to other people your problems are not so important like them.
Have you ever felt like jumping from the top of the building while you're looking down? I did. Many times but especially yesterday. I always come to this thought what will change or how my life will change if i continue still? Wouldn't it be easy to just to end it?
I know the right answer. Right answer is no. I know life can change in a second in a bad or good way but still it's a chance there might be a good way. But those are the just moments i know. Just a second you just wanna end that bad feeling.
As i have to say i'm pretty smiley person, i laugh, i pretend like i'm happy constantly. I forgive, i try to be happy with the things i have even i thought i dont have many things.
I had this very complicated days lately. Don't know what to think, what to say or where to go.
I feel sad but i smile. I say every 'how are you' question, oh yes i'm fine. I make jokes. Then i come to my room and just stay like that by staring the walls.
What is next? What is next if you're not in the place that you planned 10 years ago? What if you carrying your home in your backpack and don't have dreams anymore? What if while dreaming the only thing you ever had and you feel like you lost the ability of it?

I know it'll go away. I know tomorrow i'll be fine.
I know we are all the same.
I know we're lost in the same universe. There's no parallel universe. But just for now.
Tomorrow for me there'll be still parallel universes. And unicorns. And good people.