spices are very good for your metabolism amongst other things. I never really thought why I love it bcoz I grew up having them. Until I moved to the UK, only then I realised how much I took for granted spicy food.

It adds flavours to the food. As people mentioned, you build tolerance little by little. I do not recommend spicy food that obliterate your tastebuds — that's not how you enjoy spicy food. Try the most mild one (0.5 chilli) and build it from there. Once you build tolerance, you will never go back and see food differently ☺️👏