Hard to give substantial advice when it's not a lot of information you gave. I'm not saying you should give more, better keep it safe online.

Generally I think it's a good idea to not try to hard to put a label on yourself. In the end it's not that important if you're ace or something else but that you're comfortable with yourself.

Also, I think keeping your gf in the loop regarding your wants, needs ad feelings towards her is pretty important. Communication is key.