This is fixable. For one, stop watching porn. You jack off because you want to release, so you’re not holding back on the tension. I used to have this issue. I began edging, using the rope exercise. You basically achieve full
Erection, pace yourself with a steady motion, and the minute you feel climax, stop and control your breathing. Focus less on the sensation. Keep doing this for as long as possible. Also, do this on the off days you expect or anticipate having sex. Otherwise you’ll just pop. Eventually, you’ll have to release it.
The other option is using topical cream like others have mentioned. I use Jo for him Pro longer. Apply it before you engage at least 30 minutes before. Another option is a
Cock ring. This will trap the blood flow and make you rock hard while also preventing premature. Just make sure to remove it before you release and also to not wear it for more than 20 minutes.
The main thing is to treat those masturbating sessions like going to the gym. Even though the penis isn’t a muscle, it’s all about training it like it is with the goal of making it stronger.