I'm so sorry to hear you have to move out of the family home. It sounds like this is a really big change and you're feeling really stressed out at the moment.
You said you considered suicide - please call emergency 000 if you are at risk of hurting yourself. There is also suicide call back service 1300 659 467 and lifeline 13 11 14, if you need to talk to someone.
If you will not have enough to buy a place outright, there are more financial and shelter options available to you. You may be able to rent for a while, rather than try to buy outright. Or if you have family or friends to stay with temporarily, perhaps that could be an option too. It would have the added benefit of being around a friendly face who can give you the emotional support you need.
But importantly, we need to make sure you are safe. How are you now? Do you have anyone close to support you in person?