I'm an advocate of living together before marriage, I think it is an important step in making 100% sure that the person you are with is suitable to marry. I found out the hard way with my first marriage that a person can be a completely different individual in their own home/behind closed doors, and it can be a very dangerous thing to find out later rather than sooner.
However, there's a few things to touch on first when you are considering such a move.
- Age: You're 18. Yes, you are an adult. However, you're a young adult there's no question about it. It wasn't long ago that you were considered -not- an adult. 18 can be a fluctuating age still, and you want to consider your own personal stability before making such a choice.
- School: Are you done? Are you going to college? How are you paying for it if you are?
- Work: Do you work? Full time or part time? Do you have enough income to support yourself between yours and his incomes? Do you intend to live off student loans (not typically a good idea, trust me).
[which brings me to Budgeting: Moving out together means you have to pay for - clothing, food, utilities [heat, lights, hot water, etc], health care expenses, transportation, and so on. All on your own. Are you prepared for this?]
- Family: Are you prepared for the consequences of moving out against the wishes of any family members? This can put a real rift in place that can hurt family relationships.
- Marriage: Has it been discussed? Even though I'm a fan of moving in together, I really don't think it's something to be taken lightly. If you are moving in together, I believe you should have first contemplated and discussed marriage at length and make sure you see a future in this relationship.
A couple other things to consider:
Do not go into DEBT to move out with your boyfriend. No credit cards, no lines of credit, no STUDENT LOANS. If you cannot move out under your own income, it's better that you wait until you can both support yourselves. You do not want to be in huge amounts of debt early, and student loans are first and foremost for your -education-.
Make sure you are not pushing school aside to make such a move. School is more important than your boyfriend, -more important than-, read those words carefully. Get an education.
Do not move in with him if he is the only person making MONEY. If the relationship were to turn sour, you would have no way to get out. Have your own personal resources available to you.
None of what I've said is meant to deter you from moving out, but it's meant to challenge your ideas of moving out and make sure you've thought of a lot of these things.