Red spots on chest and back

don't touch them and not eat any spicy food and just bath in water

Okay so my dad said it could be heat rash or a rash from my sports bra. But since i have to wear it for soccer every other day how do i get rid of it?

This, indeed, can be a heat rash, happening due to excessive sweating in hot weather.
Try to keep the area cold and apply some powder.
It is important to avoid sweating for few days and the rash will go away on its own.
If you had some viral infection recently, like cold sores, this rash can be triggered by the viral infection, and is known as erythem multiforme.

Best wishes!
Marija