You don’t really need to shut off your feelings but you need to learn that you don’t always have to, nor should you always, act on your feelings.
It’s better to learn how to avoid getting into situations that may be harmful for you, that you may be tempted to enter because you have strong feelings.
If you can learn to say no to friends who want you to do something dangerous, like driving while drunk, or getting high on drugs because everyone’s doing it and you want to fit in, you will be doing yourself a valuable service in the long run.
If you can learn to spot the red flags, with regards to romantic relationships, and then walk away from those people before they harm you, you will be doing yourself a huge mental favor down the line. It’s very hard, especially with people whom you find physically attractive, or with people who have given you compliments or told you what you want to hear.
If you can learn to keep calm under pressure, whether it be at work, or when you are driving in terrible traffic, you will do yourself and others a valuable favor, by being reasonable. If you can learn to control what you say and how you say it, you can avoid making comments that you’ll regret later and you’ll avoid inadvertently hurting people’s feelings by simply blurting out things based upon your emotional state at any given moment. You’ll also be less likely to be involved in a car accident if you can learn to drive safely and competently even though you are tempted, by emotions, to run other people off the road or to flip them off or to tailgate them or to flash your lights at them.
So in the long run, it’s better not to turn off your emotions but to be able to learn to control your behavior with regards to the temptations that your emotions will inevitably throw into your path. If you can learn to do the right thing, despite the urge to do the wrong thing or the expedient thing, you will be doing yourself and society a huge favor.