Security clearances look at your whole person. What they are more concerned about are patterns of behavior, inconsistencies, finances, and withheld information. No one has led a perfect life, but some problems are more concerning than others. What they are going to want to know is: How does the story they got from your friend fit with the other stories they're getting? Is it consistent? Do the people they talk to describe you in similar terms? Do they describe similar behavior? Or is there something about *this* story that stands out as an outlier from the rest of your background? Does that fit with any other information they have obtained? That's what they're looking for.
Security clearances are a psychological profile -- it's an attempt to predict future behavior from previous behavior and information. You can't measure trustworthiness on a test. That doesn't show up on the ASVAB. They really only have prior behavior to go on. If you have been a demonstrably responsible person; if the pattern of your life is one of someone who is responsible with their money, time, and values, then your clearance is in good shape. If the pattern of your life is one that demonstrates you will lie or manipulate when it appears in your interest; if your life is marked by financial turmoil; if the people in your life all tell remarkably different stories about you -- then you're a bad bet.
EDIT: I read your other posts. You have a bigger problem. You have a weed story AND non-prescription (read: illegal) Adderal use. That's two independent recreational drug stories. That's going to be a no-go for a TS clearance. Just on Y!A alone, you've demonstrated a pattern of poor choices and not being forthcoming about that. Patterns of behavior are what they are looking for, not individual instances. You claimed the weed story was a lone incident. It's not. They are going to read your drug history as a pattern of behavior. That's a much bigger problem for a clearance.
Former USAF flight medic and training manager