Yes, it can get a bit woo woo, can't it? (That's like raa raa but a bit different.) Although, I think that this brand of positive thought is what gets some through the day. I think for some, it gives something to focus on. I guess the sort I aspire to and hope to maintain is a positive realism. I think if I didn't, I just wouldn't leave the house. It's about believing that I can face the world and negotiate my way through any difficulties (though that can be a bit shaky, these days). It's about knowing that I'm here, I'm alive and I'm doing what I can to make it good.
I've always subscribed to the theory that as a day to day thing, you can choose to feel happy or you can choose to be miserable. I have found over the years that it works as a rule though it has been sorely tested over recent times. I'm not meaning that I hear really bad news and decide to be happy about it...it's more along the lines of something not going quite my way and choosing not to dwell on it. And sometimes it can feel like a physical adjustment to make it happen.