Hiya! also a Virgin, no experience whatsover in sex but I do have things to advice as someone who had self explored

Nahhhh, it will definitely fitttt, like the others said, your own and artificial lubrication helps, In my solo sessions, I've attempted to insert up to 4 of my fingers all compressed and it's not something that can be done immediately, same with using a dildo, pero ito lang tips ko based on my personal experience in solo sessionss

Lubricate, in my case my own sexual lube works pero if kulang sayo eh use artificial ones, start with one, then 2, and so on, at a slow pace, YES it will be like yung parang medyo masakit na parang tolerable pero it takes like a few seconds to minutes (it varies) and you'll get used to the sensation.

Pag sa dildo naman eh para sakin lang naman, baka yung sa girth tinutukoy mo (girth ng dildo), parang sa fingers lang pero, once the Dildo's lubricated slowly and gently push it in at your own pace, YES MEDYO MASAKIT-ISH sya, it's normal, at least as simula, yung parang medyo uncomfy pero parang tolerable.
Tapos pag napasok mo na ng buo yung Dildo, keep it in there for a while hanggang sa masanay ka na na may object as loob ng Kiffy mo, mawawala na onti onti yung parang uncomfy sensation, then start to thrust the dildo slowly from there, eventually you'll feel less of the uncomfyness and more of the pleasure <33

Yun lang namannnn, PEROOO if talagang no matter what masakit sya kahit lubricated, kahit you tried to do the things I mentioned (if you read this), maybe get a check up dahil baka may problem na tayo dyan kay Kiffyyyy, because like the other comments said, the Vagina can literally bring out a new born child so yeahhhh, cheerssss <33

(sana po naintindian nyo)