am I too young

Yes, you are too young as sexual activities no matter what your plans are going into such a relationship can lead in short order to babies.

At 14 neither you or your girlfriend who I am assuming is roughly yours age have any moral rights to take any chance at all of bringing a new life into the world that you have zero ability to take care of.

You need to allow yourself time to become far more emotional mature before entering into even mild male/female relationships.

Yes, you are too young. Of course, why take our word for it. Ask your parents. If you cannot discuss it with them, then you are not mature enough to have the relationship.

but were not going to have sex because that is too serious and we cannot handle that responsibility,we are just going to fool around in other ways

Where in my reply did I say anything about sex? You are too young to fool around in any way. But I repeat, don't take our word for it. You have parents. Talk to them. If you are too immature to do that and ask them what they think, then you are too immature to be fooling around, whatever that might mean to you.

My you and your girlfriend have invented something beside sex when the term fooling around is used?

Oh and sex mean a great deal more the intercourse however sexual foreplay can lead in very short order to full blown intercourse as that is how males and females are wired and at 14 it is unlikely either one of you will have the control to limit/control such behaviors.