The "not knowing" willing drag inot Depression and hold you back from a happy life. If you let it.
How much of those plans where yours? and how much were hers? If you find that it was mutual, meaning you really wanted all of those things, even without her, then continue working towards them. There is no reason why you can't still go buy a house, and do all the things that "you wanted".
Its nice to make plans with someone and sometimes we allow ourselves to change our plans for them, but something to think about in the future is "would I make this plan on my own?" If you can answer YES. Then cool.
As for "her stuff"... go to wally world, or the mall, get a few boxes and tape them shut. Put them at the back of the closet and forget about them. Chances are she will bring an escort or maybe even send someone to pick them up for her. This will save you a lot of headache and heart ache when she does.
I'm very glad to hear that you already graduated and have started your career. That will help.
What do you want to see happen over the next week, the next month, over the next half year and year? Where would you like to be? honestly...