Serendipity doesn't mean you're crazy, some people experience it more than others. Just relax. If you think that every time you experience one it means you're going mad then maybe you really will :)

All the existence of serendipity points to is that mainstream science doesn't fully understand how the universe works, it doesn't mean that you're crazy.

"Reality is that which, when you stop believing in it, doesn't go away." - Philip K. Dick