They come to exist whether you want it or not.
It is not always possible to share the images and memories in your mind.
Don’t feel miserable, feel rich and unique. The things that you think of belong to you only. Don’t be lonely if you can’t reciprocate, be curious.
Sometimes you are able to live through a moment together with someone else. But even then; two people have two very different ways of remembering the same.
And then there is forgetting. A forgotten thought is an absolute secret. Has no owner. No expression. No evidence that it has ever been.