Heart issues

Recently on my runs I have been getting heart rates from 170-185 bpm going at a slow pace. Last year they were at 150-160. There is always a weird feeling in the middle of my chest and it hurts when I am exercising. I just got back to consistent running after 8 months of healing from a fracture and I am 19 years old. I don’t want to spend money on something I don’t understand. Anyone out there who can help guide me? I’m not sure if it’s because I’m out of shape getting back into shape or a serious heart/lung problem.