With that cash you could get most of the way around the world and have the most brilliant life-changing and mind-changing few years of your life. If I had the cash you have I would do exactly the same. I'm young and doing things bit by bit.
You could go to India and such places and learn different spirituality, you could go to Thaiiland or China, etc and take up and master Martial Art, you could spend 6 months on a beatiful Thai beach for 1500quid. You can do anything you want.
The opportunity for self-improvement is unlimited! Spend some time in Tibet and India and learn from the Dalai Lama. Well, do whatever you want! They world is your oyster!
Don't have the attitude of 'I don't think thats for me', a years experience out there could be worth 10. You will constantly be improving yourself if you allow it! Just don't hold back!
Sorry to go on about basically nothing but I'm excited for you! Get out there and enjoy yerself, you will NOT regret a minute of it!