I dread the future but have no motivation to make it good?

I'll explain a little. I've never been good with change. Right about now my life's not great but there are things in it that make it good. But really soon I'm going to lo se those things that make it good. I'm terrified about the future. I can only picture sadness and loniness. Complete isolation. I know it sounds dramatic but seriously it's a horrible feeling. I can't see myself being happy with people around me that love me I just see myself bein haunted by happy memories of being hopeful and excited (how i was when i was much younger.) Please help.