Sorry to burst yr bubble!
I've had more than a few PM wanting it but who have never taken their own finger...
Unless yr practising shoving stuff up there or really desperate for it ur not gonna take a10 inch dick with ease. Porn is fantasy, they're pro's and it's been edited,yr not seeing any discomfort or any other real world sex stuff in porn.
Wise words here. OP, start with some dildos and work your way up to bigger sizes. Use lots of lube, more than you think you need. Shoving a big cock up an inexperienced hole leads to two things. 1) Raising a white flag and giving up once you realise what it takes. 2) a wrecked hole with anal fissures, tears, or even prolapses. All of these things will limit your arse play for some time to come.
I currently have a friend with 8" and I'm struggling like hell with taking it, and he's really patient. I'm getting there! It's really not like porn where the bottom is coked up, thoroughly douched, and probably just been fucked by a few smaller guys to loosen him up.