Pumps Hurting

Ok so I took the advise and did some research and finally bought a pump from Peak make physique and it came today. The air pump one with the gauge. So from what I’ve read, people usually pump to 10-15 inHg. Well I just tried it and couldn’t go past 10 inHg and even then my dick was hurting so bad and felt like it was about to explode. Couldn’t last for more than a minute and I had to stop. Also I did notice a lot of swelling/edema Is this normal?