I'm not really sure it's something you can "modify." Even if I slow down work-wise I'll still have to be the best girlfriend/wife/friend, the best at xyz hobby. I'm hopelessly type A and failure, the few times in my life it's happened, has been crushing.
But there is hope...A few months ago when things started getting really serious with the bf...it was because, and I told him this, he quieted the noise in my head. When I'm around him none of that crap matters and I can just....be. I think as long as I have someone in my life, whether it be him or someone else, who gives me that pause....that comfortable silence and relaxation...I'll be ok.