Lasting

I’ve been with my boyfriend for 2 1/2 years and we barely started having sex about 4 months ago. We were both each other’s first and he gets into the mood very easily. But ever since the first time he usually only lasts 4-7 minutes every time & I just don’t feel like it’s enough. I don’t know how I should tell him to last more w/o sounding rude. We’ve had sex about 5x a month and he hasn’t been able to make me orgasm or anything... I just feel like there’s no point to it and it’s all for his benefit