I once made a flippant comment that I wanted "Well, she tried" put on my tombstone. A friend chided me and said that was negative. I disagree. There is nothing negative about trying. It's in the trying that we live. Success and failure both lead to more trying. Don't they?
The point being that negative thoughts and beliefs are just that-thoughts and beliefs-not facts. It's okay to have them, everyone does, as long as you keep trying. It's when negative thoughts block you that you need to address them. Put them back in their place. So that you can try once again and live. Cheers~