hey doc..actually, with your qualification, you should not have any problem with your career. i mean, u've got a wealthy family (i assume)..and with your experience in work, u can get another good job in other companies should you choose to leave yr family business..but i think u're tied up because you don't wanna let yr dad down isn't it?
try to spend time with her..a girl who waited you for 8 years, and still loving you (and vice versa) is definitely worth to marry..you may wanna put yr job down for a moment and be with her when she needs you the most.

the above is purely my suggestion as an observer judging on facts provided by you