An elite athlete has to choose this lifestyle (like Harry says)... it's not a particulary healthy, wealthy or wise way to live but it does give you lots of experiences out in the big world! The 'lottery squad' was like a big extended family... not always happy smiling faces but often enough to make it fun & enjoyable to be part of (although different from the parents side that I was on from the kiddies in the squad)...
Ultimately life needs to be fun & enjoyable... get that right, throw in the correct balance of training and support & you are a long way down the road.... but remember, even as a full time athlete you can only orienteer / train for a limited amount each day... the rest of the day needs filling usefully as does the rest of your life once you retire
You definitely need balance, each bit of stress (physical or mental) has to be balanced with enough recovery (anything that gives you energy back) but you need a certain amount of obsession with the details because someone out there is obsessed and they are probably going to beat you! 
