Go for the evaluation! Psychological evaluations are there to help you when you feel like you aren't functioning optimally and reaching your potential in your life. They are valuable assets.

I was actually recently diagnosed with ADHD. I was so surprised because until this year I managed to maintain a high GPA throughout school and even made the Dean's List several times. I hope to pursue a doctorate in clinical psychology. I think like you, I flew under the radar from being noticed in elementary school because I was able to get good grades and so they didn't see my behaviour as a problem. Finally, my procrastination and disorganization caught up to me when I tried to finish my honours thesis! So I'm dealing with everything now. It's worth it to go and see if you have it. It could likely help you in the future in ways you can't even fathom.