I have vaginal pain after sex......what does this mean????

Hello, I am an 19 year old girl, and ive been dating my boyfriend for about 2 years,been great friends when we were in school, i know alot about him, And hes 21, hes had 3 other sexual partners, and has been checked out, and hes my first, and hope to be the only.... we've now been having sex without a condom,which i did reasearch about doing this talked it over with my doctor, so that part was good. I am on tricyclen low 21 birth control, My problem is that when he enteries me it hurts(as i mean hes a big size) but once hes in, we are good, but after sex I'm sore,with a burning sensation and it hurts to touch my vaginal "hole"...What does this mean? Am i not "wet" enough when he enteries me? should we use KY Lube ( vaginal moisteriser) but when we use the lube and i'm sore from 2 nights before,when we use the lube, it burns like its really dry... But when we do use it and i'm not sore when we have sex,say a week since we did last hade sex, im all healed,and if we use lube, but it has to alot of lube though, then i'm fine.. Does this mean we need more foreplay? to get me wetter? Like he tells me i'm wet and i feel wet but when he does a little fingering before sex its like he wipes it dry or something? i really don't know? I had called my mom and she figures "not enough foreplay to get me in the mood".... I might go try to see a doctor soon about it, as it puts a damper on our sex life..Any ideas???Thank you hope to hear from someone soon :( :D

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