I went on my first night dive. I have had a total of 6 dives. Location was La Jolla Shores in San Diego. My buddy said had 500 logged dives. He knew my experience level. I told I was limited to about 60ft and to head back @ 1700psi. We went down to 60, headed over to a canyon wall. I noticed he kept decending. I check the computer [80 feet] and followed him. I was mainly focus on bouyancy and not hogging air. At 1700 I informed him. At 1500 I informed him. He finally left at 1000psi. I informed him at 500psi to surface. We were at 34 ft. He insisted we carry on. At 200psi we started to assend from 21ft. We trying to do a safety stop, but I was really bouyant. I had a tough time floating at 15 ft. At the surface I had 120psi. I was calm through out the whole event, but he was taking chances with my safety. Next time I imagine I should be more forceful on the leaving part.