Hi Treetop12.
I have just split from my ex of 6 years and am a similar age to you. Like you, my life is very 'up in the air' at the moment, and I have no idea if I will be moving home, or able to find a house to move into. I am backwards and forwards with my thoughts right now. and sometimes the uncertainty is the hardest bit.
We just were not compatible and whilst we had some amazing memories, things just no longer clicked. To have to walk away from someone you still love because you don't have any answers or solutions is probably one of the toughest things I have done!
I completely understand how it feels to be losing someone so close to you, and not only are you grieving for your past and memories, but also what could have been as part of your future.
I actually posted on here a few days ago and I received some amazing advice (worthwhile trawling through the threads to see just what people can move on from, and to seek out the positive advice too- it definitely helped me reading other peoples stories).
The advice I picked out the most: Talk. Talk to friends in person, talk to people on here, talk to whoever you feel comfortable with. Keep your routine and hobbies as much as possible, and try to keep yourself busy to keep your mind preoccupied. Don't be scared to cry when you need to, and don't be scared to lean on those around you for support when you are having moments of 'omg what is going on'.
Try not to reminisce or picture what could have been of the future. You don't know what it could have held, but deep down I (and most likely you too) know that if we had stayed with our exes, we wouldn't have been completely happy, and had kids and marriage been part of the picture... how much harder would it have been if this situation then arose.
Going home is an absolutely horrid thought after so much independence, even if you have the most lovely parents and siblings in the world. As an adult you are use to your routine, your space, your own life. But most mums will do a fab job at looking after you, feeding you yummy home cooked meals, and ensuring you receive plenty of TLC. Use it to heal. And use it as an opportunity to seek pleasure in home comforts, and to save as much money as possible towards your next house.
There will be some tough days (been there, going through it), but if you know deep down things were not right, just rest assured that in time, that feeling will grow, and you will begin to see and have more faith in your decision. Hang in there - it will get easier.