How to experience Karma?

Today I realize that, if something good or bad happens to me, it is caused by Karma. It gave me a huge relief. Because before I would experience aversion when something bad happened to me. But now, I believe that I am 100% responsible for whatever happens to me. But, As I know, not everything is caused by Karma. There are some other reasons such as whether, Dhamma etc. So how can I know the real cause behind something for sure? (Is it Karma or some other cause?) It is said that someone needs to experience the truth to understand the truth. So how can I build a solid understanding of the cause behind things and Karma?