You need to see a New Mexico attorney. The prosecutor could try to charge you as an adult with the same level of penalties. As to the pills being for personal use, the statute is not likely to be drafted based on your intent. It is more likely that the legislature determined a specific number is a personal use amount and another is a dealers supply. You may be seen as having a dealers supply even though you were buying in bulk. There is a statute of limitation to bring any criminal action. If your case were in Illinois, the State's Attorney (prosecution) has 18 months to bring the case. So, you need counsel and be prepared they may take their own sweet time.
This is a general answer and does not address the specifics of your individual case. To give the specific answer you need our firm needs you to come in for a consultation.