Some of this came from you being anxious about your performance, since the same day you were able to get hard and ejaculate twice thereafter. But mostly this is coming from porn and how you have excited yourself over the years. If you want to improve, drop the porn 100%, do not ejaculate from HJs or masturbation. Save it all for the occasion.
This will not be fixed over night. The affect of porn on what excites you will take a while to be eliminated.
Lastly, recognize what excites you, like HJs in some manner does, and use it within your sex play without ejaculating. You should learn that women take time and stimulation to be ready for penetration and for a while you will need this too.
"anything sexual" absolutely includes masturbating to porn, a frequent cause of ED in teens.
take a break from porn for a few months, and masturbate fewer times while fantasizing.