I am sorry to say that as you caused the accident and are uninsured, you are liable for costs of repair for the damage on both vehicles. You are also correct in that the insurance companies concerned (for both ladies) will pursue you for the cost of repairs. It would be advisable to contact the insurance companies and set up an immediate payment plan. Irrespective of the costs to repair, if the insurance companies have accepted the quotes that the ladies have given them, then you will have to pay those costs. Irrespective of whether you are an international student with no income or not, it is your responsibility to reimburse any costs incurred.
My suggestion would be to approach your family/friends/bank for help in this matter (financially) as this is not going to go away - sounds like you will end up in court one way or the other with additional court costs on top of repairs.
If you had had basic third party insurance, you would not be in this predicament. Third party insurance covers you for any damage you may cause in the event of an accident but does not cover your own vehicle.
I am sorry there is nothing further we can do to help you in this matter - you are just going to have to do what you can as quickly as you can. Unfortunately, this is going to be a very expensive lesson for you to learn.