Too long...?

Me and my bf of 4 months are ready for the next step. I have had sex before, but he is very long. Around 24cm long. All my other bf were way smaller. So, im kinda concerned of him nkt fitting inside me. I googled some problems u might face when you have sex with very long penises and i read that it can hit your cervix. I dont know if i have a short channel or not, but i dont want it to be painful. Is it possible that really long penises dont "fit" and can damage your cervix? Thanks for your help