An engineering degree will be very useful for all sorts of fields. So your flying part 91 and decide if that's what you like. I'd so, work the engineering field a bit and save some money (you'll need it!) and flight instruct on the side to build your time (or banner tow, fly jumpers, etc). Some cash saved up in the bank will help! Three years if engineering salary is about 6-8 years of regional FO pay.