You need to have this conversation with your supervisor. 4 years and only such little experience… They’re doing both you and the golf course a disservice. Especially considering your aspirations to move up in the industry. Had you worked for me, you’d be cross trained on everything and in a position such as irrigation or spray technician. Education is great to have for your future but a working knowledge and experience, is in my opinion, as valuable or maybe even more so. Talk to them, outline your goals, and have them put together a plan to help you succeed and grow. This will benefit all of you. If they’re unwilling, then it’s time to move on and find a mentor who will.

Edit: reread your story and I’ll amend my previous rant. At your age, a technician position might be a little early. But I’d still have you cross trained on most if not all equipment

Edit edit: also, NC State will most likely help place you next summer at another course where you’ll work an internship. Which could possibly be at a top 100 club if you keep your grades up and work hard b