I'm 40- I have Clinical Depression and ADHD. 
In 2014 I had a severe mental crash during which I tried to **** myself. I don't even want to write that, much less think about it. 
My 1st major episode of depression, from what I remember, was at the age of 15. I got a diagnosis and meds at the age of 22-23 something.

My Q is: how many of your accept challenges that life throws at you and "crush it!"? 
I'm unable to. Everytime there is a challenge, when things start getting too difficult and it stresses me out, I give up. When compared to others who are outperforming me I say to myself "oh well, he's doing so good because he does not have to deal with depression and adhd. I'm not doing that bad. If he had to deal with what I do, he would crash under the mental pressure."

It's what I tell my psychologist at every session. Considering where I was when I started therapy almost a decade ago, I am doing much much better. 

But I often wonder, can I do better still? Am I short changing myself by taking the easy way out and using depression and adhd as an excuse? 
Is there anyone out here who has set goals, pursued them NO MATTER WHAT and achieved what they want? Competed against "normal people" and come out the winner?