Your path exists but it requires patience and stubbornness:
You’ll need to get your dental degree in Iraq first.
If your university offers a semester or year in the US, apply for it (tip: if there are several universities, choose a smaller one or one in a small town since your odds are better - this website can help. You’re not going to be a tourist, right? 
You can ask for advice on all choices on this website.)
Get your dental degree. Do your best to survive till then.
Be aware that right now there are terrible student visa difficulties.
Your father should hold on to his extra house for the next step.
You need to complete your education:
Then follow these steps
https://www.asdanet.org/index/dental-student-resources/tips-for-international-dental-students