Yes it is and you should try it.

Yes it is and you should try it.

I think you should do whatever is going to make you feel good, happy,
and proud of yourself. If you want to have sex just to have sex, do it.
There’s absolutely nothing wrong with that. But if you know that you
might regret doing it, then don’t. Just wait.
Three months from now: will you be happy about it?
1 year from now: will you feel a little bummed that you didn’t wait?
4
years from now: will you think: “wow, I was such an idiot for needing
to be just like my friends and hooked up with that loser that one time”?
You
said yourself that you didn’t want it to be casual. If that’s really
what you want then stand by it and the time will come when you meet
someone you want to take the plunge with. Wait for someone good. 🙂
That’s my advice. They won’t be the love of your life. You don’t even
need it to be a long term relationship. Just make sure it’s someone good.
Lesbians are way healthier.
They have more orgasms.

Not having a dick in you has absolutely no bearing on your hormone levels or your health. Not even in the same realm of science.
You are experiencing what is known as a lesbian miracle.
Or the plot of MTV’s Faking It…
ANYWAY.
You didn’t stop it before it went too far. You are soooooo very past that point. The moment her lips came near you and her hand went between your legs ended any chance of your “just friends” status. The only thing to do now is to take it and go with it. She’s your best friend. You love her. She’s reciprocated. Time to find out what’s there beyond friendship.
(She needs to cut the bf loose before you do anything else though. Starting it off with dishonesty and you feeling like a dirty secret will only serve to hurt you both.)
No, that is not normal and usually indicative of a problem going on. I would make an appointment with your gynecologist and have it checked out. It could be nothing or it could be a symptom of something real happening (ie. ovarian cysts, inflammatory pelvic disease, something with your uterus, etc.) Get it checked out. Better to know than to be in pain and speculating.
Is he going slow or rushing? You need to have a lot of foreplay, a lot of fooling around and kissing and touching before trying it. And even then, you have to go slow, ease in, let your body adjust to it. The more often you do it, the easier it gets, but you have to let your body adjust – he can’t just ram into you before you’re ready especially when your body is very new to this.
Are you sure you’re wet enough? Try using a water based lube and see if that makes a difference. Also, if you’re worried or nervous about the penetration – that works against you. It’ll make you tighter and dry. Try to relax, lie down comfortably, kiss and touch and have him rub circles around your clit for a little until you’re soaking wet and then he can slowly push a finger in and test it out. He shouldn’t be jamming them in and immediately trying to fuck you.
There was a post on tumblr I saw recently that said girls enjoy fingering when “you know the difference between summoning a genie and stuffing a chicken”. So accurate.
Your body needs to relax in order to open up more to the intrusion. Have you tried oral sex? Having him go down on you? That’s one of the best things to make penetration more pleasurable for you – if he can get you to orgasm BEFORE penetration, the contractions from your orgasm will naturally open your channel and you’ll be well aroused and ready for him. Even if you don’t orgasm through oral, the oral still helps a lot because that pleasure will help your body relax, open, lubricate itself with your arousal, and make you ready for penetration. Send him down there and let it happen! Oral is gold.
If none of this works then I would say it’s time to see a doctor because it’s possible there may be some health issue going on or an obstruction that’s causing you pain. (If you can use a tampon without pain, then there’s no obstruction.)
The point is, sex should not hurt. So keep asking why and don’t ever just accept things the way they are. You will figure it out and you will experience pleasure, just keep looking for different answers/ways because sex does not and should not hurt (unless you want it to, but that’s a whole ‘nother thing).

For most women, it does take more time (and more effort) to reach orgasm. But it’s not IMPOSSIBLE or excruciatingly difficult. You just have to experiment to find out what specifically does it for you.
Work together to make sure you orgasm more often, don’t leave it all on his shoulders. He needs you to guide him and then he’ll start figuring out even more on his own. 🙂
The only thing you should change is girlfriends.