I didnt say you need to seal you emotions forever. Just for a time you need to get some fun and positive experience. When you git some good memories it will be easier to mantain normal or even positive thinking.
The worst case is to drown in spiral of suffering. You suffer - you get bad memories - you suffer more - you push back people - they hate you - you hate youself - you had more bad experience - you had more bad memories - you suffer more.
The only resolution is to turn that spiral upside down.
That does nothing with succesfull life but it produces less suffering with each iteration. Less you suffer - more you can do, but no more you actualy capable of.
Rednecks fo example uses this. And some Africans/Russians.