I was diagnosed with ADHD when I was a child. My mother didn't want me on the drugs so I struggled most of my life with it (until I had a job and could go to the doctors on my own). I tried Ritalin but I couldn't handle the side effects. I haven't been on any drugs for the last 15-20 years. Some days I'm ok, others I'm bad. I do see they've come out with so many more new drugs I've been thinking of trying some.
As for the comment that you can find structure and routines to help you cope better I found that's not the case. No matter how much I try to structure things or try to have routines I still struggle. People make it sound so easy but it's not.
In the end go to a doctor to help get diagnosed. The sooner you know what you're dealing with the better.