A dental nurse is a secure career to be in, and are really need at the moment, if the job sites are anything to go by (and people will stop laughing when your head DN or a Hygienist and earning great money).
The person working on a plane is an Air Hostess (though I think they are called cabin crew nowadays) a job where you'll get to see the world, though I imagine there is a lot of competition for these jobs.
You idea for a primary school teacher is a good one, a very admirable job (you'd get over your shyness) how about a Nursery Nurse if like kids.
Try these questionnaires, to find what they believe you should be from your answers:
http://www.google.co.uk/url?sa=t&source=web&ct=res&cd=1&ved=0CA0QFjAA&url=http%3A%2F%2Fquiz.ivillage.co.uk%2Fuk_work%2Ftests%2Fcareer.htm&ei=fElLS9n1DsbOjAfF6JmBBw&usg=AFQjCNGayU5Baz9fvvgE1bAu-e8QPPDKyQ&sig2=ApRvxcgp3EJW2RkUHuB1BA
http://www.google.co.uk/aclk?sa=l&ai=C885YfElLS_vZD9OAjAe34onHAoDKzbIB9PbDgwzL9doFCAAQAVD06c9dYLuGv4PQCqABltPu_QPIAQGpAjhmus8hVLg-qgQbT9DutBUyOMeEpAP5FosQy6yrnBrZjpNTnKUo&sig=AGiWqtzGU6ZQhi9jtLlNsyn7v1pG4bf_9Q&q=http://ipersonic.com/career
http://www.google.co.uk/url?sa=t&source=web&ct=res&cd=3&ved=0CBYQFjAC&url=http%3A%2F%2Fwww.alec.co.uk%2Ffree-career-assessment%2Ffree-online-career-tests.htm&ei=fElLS9n1DsbOjAfF6JmBBw&usg=AFQjCNGhUJyWKg0kQ_wbrV0B_ouJgswLag&sig2=efsy17lmnBPbe000L3obJw