AS it starts, I've always been super positive.
"Sunny on the inside" had become one of my favourite expressions because it had to do with feeling in control of my own perspective, regardless of how others would normally interpret a "negative" situation. In my opinion, there is no such thing as a qualitative "negative". That meaning, only numbers, or integers could have a "-" symbol signifying that a quantity is less than the value of 1.
In the same breadth, a state, a situation, an event, an emotion, or anything that happens just IS. It is neither positive, no negative. That is solely in the eyes of the beholder.
To give you an example, growing up, my family and I used to go on many family trips and vacations. Long drives to camping was a regular norm. We had many things happen on these trips. But for some reason, at the end of it, we would compare our experiences. My sister always tended to have a tragic catastrophe. I'll give it to her, getting car-sick, scratched by a cat, chased by a family of black flies, and attacked by a fish (ok, I'll admit the last is a bit of an exaggeration -- it simply fell in the boat and flopped around a bunch), then I'd call it a crappy experience as well. And for her, there was always something to complain about.
But I didn't. I always chose to experience the best of all things. The long drive, though not always the most comfortable, was very relaxing and scenic. We stopped often --though I couldn't wait to the final destination -- so we could stretch our legs, or try something new. Bug bites came with the territory of camping! I was ready for it.... and they were ready for me, no matter how many times I applied my repellent. We always had more than enough food to eat, and there was more than enough to see and do. And mine was always a pleasant, happy, positive experience with lots of fond memories.
It was just the difference between my sister and I to recognize "perspective" from a very young age. (Now, please mind you, she is not always negative, nor is she a negative person; simply for the example to display. And it was many years ago. Things change.)
So, as is it goes, my words of advice to you are to take things as they are - neither positive, nor negative. It just is. Then that way, when something comes as a negative perspective, you can also say... "Hey. it could be worse."