Congratulations on your new arrival Danielle. It sounds like things are going really well already. Sucking is important but pain is not good. Maybe you could try some different positions first to see if they help, and if not, maybe put a time limit on his sucking to give your nipples some rest. Many mums find that leaning back in a reclined position and placing baby on their chest allowing them to find a position that works can be more comfortable. I've linked to a couple of clips that might give you some ideas. I hope it settles down hun.

Biological Nurturing sample scenario
Baby Led Mother Guided Started Upright Left Breast, Latches