You will be trully happy and feel deep emotions when you experience something really fulfilling in your life. Maybe you cannot express your emotions because of the things that you have in your environment.
Also, if you really understand why you become so emotionally detached, you should accept that this was just an experience that formed you, but as you realise that you do not have to be on the same path, now you can change the direction you are heading to.
I know it is quite abstract what I am telling you, but I hope you will understand it.
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