Under Oregon law, you can receive child support if you're between the ages of 18 and 21, if you're enrolled in an accredited school more than half-time and making satisfactory grades (as the school defines it). You are a necessary party to any child support case.
It's not clear from the question whether you had an existing child support order in place before. If you had a child support order with wage withholding (how support is normally enforced), then your father shouldn't have been able to stop paying without a court order.
You should start by contacting the Oregon Department of Justice, Child Support Enforcement Division, for your county. They're online at http://oregonchildsupport.gov/Pages/Index.aspx . Ask about getting an order in place. If you need assistance, you can consult with an attorney in your area.
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If the child support order in your parent's case was from a state other than Oregon, your Father's obligation to pay child support may have ended when you turned 18. You might want to take a look at the last child support order in your parent's case.