I don't like the sex with my bf

I don't know if I am the only one, but I really don't like the sex with my bf, we have been together for 8 months and he is just the perfect guy I love him so much but every single time we are having sex he end in 50 seconds I'm so tired of it because l love sex and this is just out of control, I'm not going to let him but I'm so tired!! any tip or advise? 😩😩😩😩