Melanoma / Skin Cancer Community

Hi, I am 22 years of age, male, white. I had a sunburn (not blistering) last year in 2011 (spent 10am-3pm in the sun doing a whole body exposure) and took steps to learn more about skin cancer risk factors and how to protect my skin better. My entire body's skin tone is definitely a shade darker after this burn. At the time I wanted to boost vitamin D. I didn't know about UV danger. I now wear sunscreen all of the time when I am outdoors or in the car driving. I've become quite obsessed with protecting my skin. Like a vampire. I accept the consequences of burning like I did in 2011, and there is nothing I can do about that now.
I can recall at least one sunburn in my childhood (or early teens?), but no more than 2-3 (perhaps just 2, but not 100% sure - how can really recall their childhood so well anyway...?). Mostly within the last 5 years I've done a lot of work on our 5 acres of land and odd jobs out in the sun unprotected (always tanning I guess) along with a normal life of going outside without thinking about protection like anybody else. I've been to a tanning booth twice.
Anyways, I was invited to play tennis the other day with my family and moved my sunscreen out my car (normal storage place). I started playing tennis realizing that I didn't have my sunscreen and it was all the way at home. It was a 35-40 min. drive to go back home and get it and we were only going to play for 90 minutes. I decided to stay unprotected in the sun. I didn't want seem weird to my family about complaining about not having my sunscreen. Why am I in the wrong if I can't do anything about it? I mean, it's easy to forget things and gets frustrating. I believed my family didn't have sunscreen on either (but boy was I wrong as one of them did!)
I didn't even think about a 10 min. trip to the nearby store to buy some more sunscreen. We were out in the sun from 1:30-3:00pm. I live in WA state, USA (northern US). I'm pretty sure we were out in least high UV (6-7/10). After 3:00pm onward I seeked shade. I seem to only get the worst of the sun at the most unfortunate circumstances. My fault??
Now I really regret doing this more than I did at the time. My skin is really dark but not burned. No peeling. Some warmth, some itching, some irritation/stinging. You can see some redness. My face, neck, ears, arms, and legs all got it. Not too bad, but a half an hour more maybe and I was real close to another sunburn.
Am I over-worrying or not? My cure to the issue is to keep the sunscreen bottle with my wallet and keys and keep it in my jean pocket, so it's always with me. I plan to get genetically tested in the future for all cancers and keep on eye on my skin for changes in the future as well as see a dermatologist as needed.


Source: I have a degree in biochemistry so I understand the mechanisms of tanning/burning.