Any conviction can have immigration consequences. What those consequences are can only be determined through a review of the court disposition and the statute under which the conviction took place.
You should retain an experienced immigration lawyer, whether myself or one of my colleagues, to review all the facts, advise you, and handle the case.
J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature and does not constitute legal advice, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship. Answers on Avvo can only be general ones, as specific answers would require knowledge of all the facts. As such, they may or may not apply to the question.
You need a good criminal and immigration attorney. I am not familiar with Oregon law. However, crucial factors include the actual sentence (even if suspended), the time since you became a permanent resident, and the maximum penalty for the crime. Certain state misdemeanors are classified as felonies for immigration purposes, and certain diversionary programs still count as convictions, as do expungements.
This general information does not establish any attorney-client relationship. There may well be factors not mentioned in the question which could and should be addressed in an attorney consultation.
Is either of your parents a US citizen before you turned 18? If yes, you may already be a US citizen. If you are a US citizen, the outcome of the shoplifting case should have no effect on your immigration status.
You should review with your attorney the specific facts to find out your legal options.