We all suffer because of ignorance , this illusory self image we create , wanting things happening , not wanting things happening , attachments , aversion , craving , clinging , not understanding a thing because we don't even try to observe what is really going on inside of us .
You are constantly interacting with the objects of the external world with your sens organs and your mind . With this illusory self you created , you form this ego , and anything aimed at this ego is going to affect you because you have a tremendous amount of attachment to it .
Also a weak mind will wander incessantly in imaginary thoughts , fear scenarios that don't even exists for example , yet the sensations they will bring will be real and your mind will instantly label those sensations as BAD , UNPLEASANT sensations and you will feel miserable.
Sensations are just sensations , thoughts are just thoughts , words are just words , emotions , feelings .. You don't have to react to them !
Learn to observe your own body and mind , the interaction with each other , by doing something as simple as observing you can become truly happy !