Many people feel stuck in their lives and blame their stuck state on something external to them that “causes” them to feel stuck. That something can be arbitrary, such as “unhappy childhood”, an “unpleasant event”, a sense of incapability or any other “obstacle” that is seen as external to oneself. It feels bad and it feels real. It is so real sometimes that the entire moment right now is defined by the block.
When you have been diagnosed with depression, typically you would have been told you require a lifetime drug therapy, and something is “wrong” with you. According to an established medical tradition, you are “broken”.
If you have been suffering from depression, you must realize you have been creating that state for yourself.
NLP techniques are useful only when applied, having unraveled the structure of the experience we want to change. By themselves these are useless.