During your sophomore and junior year you should start adding some serious muscle and see time drops. Keep at it.
According to Collegeswimming Purdue has freestyle swimmers are below 21 for the 50 free and 45 for the 100. Their fastest swimmers are below 20 and 44. https://www.collegeswimming.com/team/27/times/?page=1&gender=M&event=1100&course=Y&season=22
Talk to your coach and see what you need to work on.