How to last while kissing your SO?

Hey all. Apologies if this is in the wrong section.
So, I'm the Porn addicted one in the relationship. Been addicted for about 6 years now.

The story is, with my ex girlfriend, after kissing for an amount of time, I eventually get overexcited and O.. I put it down to P and how I PO'd when I was younger, never M. Also, inexperience would play a part, I guess..

Anyway, is there a way for me to not O while just kissing with my current girlfriend? Because she is experienced and would know what happened if I do O..

Thanks,
WSMS.