What shall I do now?

I finished university in May and since then I have had plans to start a postgraduate course which fell through and so I find myself here. But where is here exactly? Well throughout my time at university studying I was lucky enough to have a job. For the past 3 years I have worked at my local DIY store, mainly at the weekends until recently. Now I find myself working full time hours there which obviously means more responsibility and more time spent there. I have always tried to do my best at work, especially when it comes to helping the customer. But since I have started full time I have been noticed more in doing a good job at work and appreciated by more colleagues. I have even been chosen along with 6 others to go to a trade show in Lille at the end of this week. But thats for a different blog. 
At the end of the summer in Malia, I did some soul searching and decided that I want to help people. The problem is I don't know where that is going to take me. I have a degree in International Business & Philosophy with an interest in just about everything. The choice that appealed to me the most at first was to be a teacher and help change the lives of young people. But whilst studying my degree I really liked the HR modules I did and helping people progress their career and  development seems also very interesting to me. The dreamer in me wants to change the world, so maybe a job in the Civil Service as a Diplomat is the right step to take? My current job is advertising for an "Aspire" programme to become a trading manager after an intensive 6 month course. I am currently applying for it, because strangely enough I actually enjoy my job. Its different everyday & I get to help people. Most of the people I have worked with over the past few years have made me have more passion for home improvement and our little store. Many graduates I know don't have a job at all so I know I am in a fortunate position to be able to apply for something like this. I am still not changing the world, but I've got the rest of my life to do that, right?