Anal sex

Okay so me & my boyfriend have lately been trying to have anal sex or wtv but every time he puts the tip in it hurts a lot but I have heard that the more you do it the more you will get used to it but it's been like 2 or 3 times that we've tried it but I still don't get used to it but I wanna keep trying because he likes it

So I was just wondering if yall could give me some advice