The problem with seeing solutions in things like hypnosis, is these are very passive - the perception is you yourself don't need to do anything except switch on the tape/mp3 and listen.
Any personal development involves making changes, which most of us find difficult - as Christian223 said, we need to step outside our comfort zone.
To make interesting friends, do things that interest you (ie pursue a hobby/sport) and take interest in those you meet. To make a friend, be a friend. Not everything will work, not everyone will respond - that's their problem, not yours.
To improve your body language, assertiveness, general self confidence does involve practical work - you don't learn the skills to ride a bike/car by listening to tapes! You are learning to do things differently, not just think differently.
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