I think it's impossible to tell you to not feel bad about it, because we are talking about 7,000,000$ dollars. Anyway, you aren't the only one to face this harsh situation. There are some stories on the internet of another early investors who have also lost access to their wallets which were replenished of Bitcoins.

My doubt is, why some early investors were so careless over their coins back then? Didn't they believe Bitcoin have potential to become valuable like we see nowadays? Weren't they faithful adopters who were holding thinking on long term gains? What was their purpose by accumulating Bitcoin if it wasn't to store and keep it safely, then?