One thing that came up strongly is the fact that you keep mentioning you're an introvert. There's nothing wrong with being an introvert. But you should work to be an extrovert when needed. I know tonnes of people who are introvert by nature, but extrovert when work requires them to do. Its a norm, so get over it.

People have offered you their opinions, but you seem hesistant to accept them. You keep going round and round about securing another paper degree, and are picky when it comes to the type of industry you want to work in. I get it. You are young, with no financial committments, probably still living off your parents. Your family must be rich (to send you to UK to study), or you have a long dist degree (study locally). You're lucky if its the former, else good luck to you on having a generic degree (through long dist). Btw what's your honours? Without at least providing more information about your academic credentials, people cannot provide further inputs.

You also talked about management trainee programme. Well how sure are you, an introvert, will excel in it? Frankly speaking, how can an introvert even communicate with student (you being a student coach or something). Maybe you don't even comprehand the meaning of intro/extro.

A word of advice here. Passion can be cultivated. When you're good at something, that something can become your passion. But when you're bad at something you're passionate at, more often than not it will cease to be your passion. Don't be so narrow minded and keep harping on what I cannot do, don't want to do, not good at, no passion in etc. Any potential employer won't want such employees.

Unless of course you have a rich family to fall back on, then that explains alot.