MacBook Air (Mid 2012) Can’t read hard disk

Everything was fine a couple days ago until my computer froze, then when it restarted it had a missing file logo with the “?”. I tried to preform first aid to repair the hard drive in disk utility but it said everything was fine. Then I went to reinstall the MacOS and I couldn’t select a drive to install it on. Now when I boot up in disk utility I only see the MacOS Base System, and the other hard drive’s have disappeared. I can’t even start up my Mac no more it’s just stuck on a white screen.