Nikos,
I get what you are saying about work, once a job has finished it's over, so you could do that work anywhere. Your issues then are checking what Building Regulations are in the country of your choice, they will more than likely be different to those in Greece. To start off you may have to get the work yourself and then subcontract work out to reliable sub-contractors who know the regulations, then you could take over after you have learned how it's supposed to be done.
On the women and relationship question, you are still young and you should continue to sow your wild oats as we say, which is basically get it on with as many as you can cope with, then rest for a day and start again. Eventually you will find a nice girl who wants to settle down, but don't tell her what money you have, buy a little old car to drive her around in and then when you are sure, you tell her you are a multi-millionaire. If she runs a mile find another one!
Cheers
Robert
(Next instalment shortly)