I'm kind of in a sticky situation. Advice?

This is something that no one here can really help bạn with as it's a rather personal decision.

It all boils down to what bạn want in life, your own goals for your own lifestyle. How important is your relationship with your boyfriend to you? How important to bạn are your dreams? How important are those things in relationship to one another- which do bạn value more? Is your current boyfriend the person bạn plan on living your life with?
Those are things bạn have to answer for yourself.
bạn should also talk to your boyfriend about it as well. He's the best person to consult about this. If the two of bạn care about one another, bạn should be able to come to a consensus about it and find a solution.

And it sounds like all of this is a rather long time from now. bạn have time to think and sort things out. What bạn want in life might change between now and then, your plans may change hoặc something else could happen to throw off your plans- the future is never certain. So don't sweat it to much for now and just talk to him about it and see how he feels. That's all bạn really can do for now.

Make sure bạn talk to him.
Don't listen to some of these other guys and just up and dump him, but also know that your future is worth pursuing.

So, my Lời khuyên is don't ask us, ask him.

Put your goals first. I don't have a boyfriend/girlfriend relationship, which means I'm free.

It's really what bạn wanna do tho.

I pretty much agree with what 8theGreat said. ...and whatever bạn do, don't let him trick bạn into having sex and get pregnant. That might trap both of bạn into a life bạn don't want, and certainly one a child doesn't deserve.
Also, is the house his to say who will stay? I'm not saying that I'm right, but that might just be something he đã đưa ý kiến to sweet talk you. I suspect that if the grandmother is living there, it's for a good reason, and she and his mom are probably not the ones who'd end up moving.
Whatever bạn decide, I hope bạn don't get hurt.