Ok, it would be easy for me to tell you that you are too young, but only you know how you feel about your boyfriend and how he feels about you.
A lot of people love being with someone, but that it very different that living with them all the time, which involves washing, ironing, cooking, cleaning and other such chores along with paying bills. These are all things you must think about and you have probably seen your parents doing when you have been ready to go out and have fun, and if you are not earning much if you do move in then you will be limited as to where you live and what your social life will be like.
If you are not sure yourself then I would say think about it again in 3 months or 6 months or even a year. In the meantime enjoy being together , but enjoy missing each other and the catching up that goes with it. Don't be in a rush to be too responsible. The fun you can have at your age is endless and you should be enjoying yourself. Don't be in a hurry to grow up.
Personally, if I were your age again, I would be having the time of my life and taking in all that life has to offer. Its a hell of a lot better than ironing.