Is Five Months Too Soon To Move In With My Boyfriend?

No one can tell you if it is best for you or not.  If you and your boyfriend are together pretty much 24/7 and you both feel good about it then I would go ahead and try it.  Communications is the key.  It is better to move in with someone sometimes and get to know them (get to know each other more) before getting married.  At least that is what I believe.  Then you know what you are getting into.  Living together is much more then dating.  You want to set up some rules, etc.  You really get to know someone when you live together.  Make sure you both have time by yourself and not to get possessive.  Set limits.  Make sure you always can talk to each other and don't hide any thing.  You will learn each others querks.  If things get tough have some where else you two can go and stay and get away from each other and have a break.  Also, there is counseling if it gets bad.  Its kind of like a marriage but without the paper.  So, you are getting into a lot.  It might help waiting longer but no one is going to stop you two if you really want it.  So just make sure you have good communication and talk about it and are doing it for the right reasons and have an escape route if problems arise where you both can stay and get help working through issues that will hit down the road.  Not that you will need to escape.  If you get what I mean.  A lot of marriages end in the first year because it is the hardest year of your marriage in some instances getting to know each other how you both live.  Good luck.

Yeah, you'd want to wait at least a year or so before you move in together. As Karina33 said, if you have some patience then there may be a bright future ahead of you. Take your relationship slow, you don't want to jump the gun too soon or it could all go to hell.

And honestly, promise rings aren't that special - guys have done that before and ditched their girls. This is just to let you know, if you didn't... I mean no harm in it, you just need to be careful.

I hope this helped, and good luck.

The amount of time that you have known each other is barely relevant.
 
How well you know yourself and how well you know your boyfriend are important.  How much you trust him is very important.  How well you can take the blame if something goes wrong is most important.
 
If you are an adult and are not dependant on others for your support, live the way you want.  Your explanation implies that you are dependant on your family and live with them as a minor.  Minors should consult their parents in matters such as these.