So when it's erect, I can fully pull the foreskin back, but it starts hurting when I get most of the way down, and still kinda hurts when it's fully back. The pain is not too strong, but it's noticable. Is this normal, or should I go to the doctor about this?
That sounds normal enough to me. Pulling back on the foreskin can tug at places where it starts attaching to the shaft, which may hurt a bit. However, if you have ongoing pain or want a second opinion, you can always talk with your medical provider. <3
It could still be that the discomfort is from the the skin being tugged as it's retracted. But, if it's causing you discomfort or and is happening regularly, then going to a healthcare provider can help you determine if there's something else going on.