Hello, bruh..... I honestly think you should let her go... She is definitely nt the right person for you. Its better she goes now than you regretting that you married her. Kindly take heart and am sure God would provide a better person made for you......
My advice to you is that you should channel your anger, sadness and unhappiness into something greater... As u said.. Try enrolling for your HND or a degree program and be the freaking best in your chosen course, also try working smart and hard.... Godspeed, bruh