Do not plead guilty - Consult with a local criminal attorney ASAP!!!!
This is not intended to be legal advise or as legal representation. I am a California personal injury attorney . Be aware that every state has its own statute of limitations; and statutes & case laws that govern the handling of these matters.
"What should I do?" Retain the best criminal defense counsel you can afford and SHUT UP. Discussing your case in a public forum is suicidal. Contact Avvo customer service about deleting your post.
Best wishes for a favorable outcome, and please remember to designate a best answer.
This answer is offered as a public service for general information only and may not be relied upon as legal advice.
You said that you can't afford a lawyer, but you need one. Either borrow money to invest in a lawyer or ask the court to appoint a public defender to represent you.
Based on the information you provided, I see potential defenses depending upon answers to additional questions that I would have if you were sitting in front of me. An aggressive criminal defense lawyer will get a thorough understanding of all of the facts and circumstances and fight for you. A conviction for a drug-related offense has consequences beyond what the statute says, it could affect your ability to get student loans. Get a lawyer asap! And good luck to you!