It honestly depends on the person. Firstly, you have to remove this idea that teaching is somehow a 'career'. It is not. Teaching is a passion. There is no reward, you do this because you WANT to, there should be no other reason. Those who burn out usually have different expectations, they want to teach because they want some material reward, it doesnt work like that. Teaching is the reward in itself. If you dont find that appealing, then dont try at all. If you want to be rewarded, dont join MOE, there are many private tuition centers that pay good money.

Secondly, teaching is difficult. You may get dumped into a lousy school where you may have to deal with divorced parents, children from poor homes, most of the time, you will be doing some sort of damage control instead of teaching. If this is not what you want, you can try aiming for JC level teaching. However, from what I know, only those with good academic credentials, ie FCH or second upper, are allowed to teach in JC. Not only that, your degree has to be related. If not, you will start from secondary school and work your way up.

At the end of the day, try not to break your bond. If you really cannot tahan, get some pills. Work your way until you finish your bond. I've met alot of teachers that break their bond. Its a bloody stupid move. But in such high stress situations, not many people can think straight.