I'm not getting hard after masterbating?

Hello all, my name is Zack and I am currently 16 years old. I masterbated for the first time using my hands (rubbing it up and down and started to ejaculate), but now after I watch porn I can't seem to get a boner, or get hard, (penis extends out). I've masterbated before but not with my hands, i usually do it while in my bed but not using my hands but with my bed instead. I hope you guys know what I mean. So is this normal?

Note: There is one topic exactly like this and that is my topic but it went through as guest so I remade it but this time with me logged in.