To begin, let's say that someone hears you play as a freshman. And we will assume that you're 18 years old, straight out of high school--or as we used to say on the Eastern shore of Maryland, "straight off the cucumber truck." An average player at this age usually has a certain amount of things together--or else they probably wouldn't have been accepted into the music program. They typically now a few tunes, they have basic working knowledge of scales and chords, and they typically have adequate technical facility, enabling them to modestly get around their instrument.
Now that we have a starting point, a tangible point of reference, I will now discuss the four categories of judgment an average student might be subjected to during the four years it might take them to get an undergraduate music degree.
I've seen many with potential wind up in this category, with me being the one rolling my eyes and shaking my head. It's disappointing to see it happen, but it does happen. If you don't want to end up here, the antidote is simple: practice, work hard and work long hours. Keep in mind that to get to the level where you sounded like a college freshman with potential took close to 8 years. However, to play at the level where you sound like a young professional with potential, you have to work twice as hard. To borrow from Martin Luther King, everything you do as a college student needs to be dealt with the "fierce urgency of now'."
So my advice is to stop poking your chest out and spouting that you're only 18 years old, as though that's an accomplishment. When you get to be 100 years old, then you can pop open that bottle of Champaign. Otherwise, the only thing you should be popping open is the door to the practice room. Time is ticking. Tick, tock, tick, tock...