Investing is all about right mindset once you develop that everything falls into right places.
The key rules are beautifully summarized by Benjamin Graham through the analogy of Mr. Market.
According to that, you are partner in a business with a crazy person Mr. Market.
Mr. Market has wild mood swings.
Every day he offers you to Buy your shares at a particular price or Sell his shares at a particular price.But leaves the decision up to you entirely.
..and even if the market acts as crazy as it can be, we should not make the market at fault with our losing trades because, at the end of the day, it is us who made the final call.
You are very much right. In the end, it is you who has to decide what to do and what not to do. It is the experience which comes into play on your every decision. If you have made a good decision, then there is hardly any chance that you will suffer any kind of loss. It will only be possible if you made correct decision.