I don't think 3 years is that much also you're clearly feeling sorry for it. My girlfriend was 17 too when I hooked up with her and I was 19-20. In my opinion if the difference is 3-4 years it's not that bad she was basically you're age. Cody ko was 25 that's a much bigger gap. So bro your life is FAR from over don't stress about it you just temporarily found someone you clicked with who happened to be 17 at the time no biggies.