"Choose a job you love, and you will never have to work a day in your life"
I am a sucker for a good quote, but never have I been able to relate to one quite as much as I do that.
If there was one thing I wish I could change, it would be the amount of time I wish away. I count down the hours and the days until the weekend, and this is time I know I am never going to get back. Life is too short to pray away the days, constantly living for the next thing; with the false promise that the future will be more satisfying that then present.
If I could give anyone just one piece of advice, it would be to choose a life where you don't dread the Monday morning's nor live for the Friday nights.

If you are stuck between doing what's safe or doing what you are passionate about. Always choose the passion. Always. If we have one life, a certain number of ever decreasing days, don't waste any of them.
Whatever your passion may be, whether it's painting or singing, teaching or sailing; find it and choose it.
Imagine if you could build a life around something that you love, and we all know it is possible. It's just a case of being brave enough to take the plunge. Ask yourself, what could you accomplish if you knew you couldn't fail?
For me, my passion is travelling. It's meeting new people and experiencing new cultures. It's when time is only a word, and whether its a Tuesday afternoon or a Sunday morning, it really doesn't matter. Nothing matters other than the people around you and sight before you. It's not having a set routine or anywhere in particular to be. It's having the freedom to live life on my own terms.
So, whatever your aspirations may be, don't settle. It may not be easy, but it will be worth it.