How to open up to my boyfriend? Our culture is different than yours

My question about is that we live in another culture not in west, sorry english is not my first language.. we are not open to our boyfriend/ husbands openly like you peoples are.. my question is that my boyfriend is not long lasting he finishes too early.. i cant get pleasure i feel that if i will talk to him about this his ego will hurt and might our relation ends. so i am afraid of it what is the best way to convey this message silently being telling him... need your opinion. we are not old we both under 30

There is a spray you can buy in sex shops or online sex shops that will delay its called delay spray. Hope this helps.