Question mark folder

Ok, so last night I was browsing internet on my mac when computer suddenly froze. I didn't want it to wait for it to fix itself so i restarted the laptop using the power button. When I started, a blink folder question mark appeared. I couldn't do anything to continue. This is the first time I saw something like that. I went on internet to look up what i had to do on my iPhone and apple website told me to press command + R. After I did it, the mac asked me for my network and I selected it. It started loading and it got to OS X utilities page.

http://core0.staticworld.net/images/article/2015/10/os-x-utilities-window-100620944-large.jpg

I went to try to restart the start up disk but it didn't show up. I tried to reinstall os x but there's no disk. I tried to go utility page but it only shows "disk0" and there's nothing I can do with that at all. I restarted the computer 10 times hoping that it would resolve the problem some how but i always got to the same page.

I went to sleep after that and when I woke up, it finally showed me "Mcintosh" on disk utility. I clicked the option to repair it and my mac started working as normal. But after 10 mins, it froze again and i had to restart. And now I have the same problem where McIntosh doesn't show up at all.

I am really lost on what to do. I don't know how McIntosh showed up for me this one time and like 20 other times it didn't. Hell I have no clue how Macbook goes from normally working to this problem.

I tried to google for solution but there are limited amount of resources and they don't really work. Maybe I should get some sort of big usb to try back up option and maybe it will allow me to re-install osx but I honest'y don't know anything about that stuff. I hope you guys can help me out cause this is pretty annoying and scarry at the same time. I have macbook pro 2013 if you're wondering. Thanks!