This situation is tricky because between you and your girl friend there are three problems. You have Premature Ejaculation, she doesn't orgasm, and she has pain on penetration.

About 10% of women never orgasm at all, but it seems that your girl friend is able to get near to it and then it stops. This is not unusual, and generally gets better with practice. She could find out more about this on the main web site, "Orgasm Difficulties or Anorgasmia". She could also look at the pages on "Dyspareunia or Painful Sex".

For yourself, there is information and guidelines about "Ejaculation Problems".

Since there is quite a lot going on, it would be sensible to see a therapist or counsellor trained in this field to help you work out the best way to sort it out.
People often have a few problems with sex, and most of them can be helped.

This is a omplicated situation as there are actually 3 problems here! You have a tendency to come too quickly, your girlfriend doesn't come at all, and she has some pain with sex. You seem to be making yourself responsible for all three when two of them belong to your partner.
As many as 10% of women do not have orgasm in any situation, but it seems that your partner has been able to get near it on some occasions. If she reads the section on Orgasm Problems on the main web site at www.partnertherapy.com that may give her some useful ideas.
Women who experience pain with sex are often a bit tense at the entrance to the vagina. Following the advice for Vaginismus will tell you both more abouit ways of overcoming this pain.
For yourself, there is a section on Ejaculation Problems which will tell you all obout overcoming your own difficulty. There is medication that can help if you want it.
It might be a good idea for the two of you to think about having a meeting with a therapist just to set your minds at rest, that this is the right track for you.