Ask yourself what subject you like. Islamic studies, history, geology, there are subjects at which we don't even look; because you feel you won't make a good earning in these.
My friend please do note you have to be persistant and work hard in any field you choose and you can do good. If you don't do good in engineering or such like professions then the end result is same.
The only place where you can get a monthly salary doing almost nothing are government sector jobs (not all of them but a lot of them)
So make you choice while you have the time and age to do so
There are no lotteries in real life you have to work hard either today or tomorrow but hard work today pays you more, the hard work you'll do tomorrow will only keep you alive
" there was a relative of mine who left his studies and wanted to be an over-night millionaire, so he had a bright new idea everyday. One day he asked my opinion about buying a car on loan and giving it to a rental agency and with that amount he'll pay some back and rest he'll invest in another taxi which he'll drive. I never rejected his ideas because at young age every dream looks real. Anyway i suggested that ok lets give this idea a try without any real money and borrow a taxi from someone and you get a first hand knowledge how it works. just after one day he was so tired that he gave away the idea immediately .. i don't need to explain what became of the rental car project'
Keep your ideas practical, be persistant and work hard that is all