Change is constant, that is the only guarantee. You can plan your life down to the minute for the next forty years, just don't fall so in love with that plan that you'll be heartbroken when it doesn't work out.
For the first time in years I laid out a plan for myself that extended beyond the week in front of me. It was a three month budget of time and money to figure out how to financially set myself up for the summer ahead, which I'd hoped to take time off and spend most of traveling. Within a week of setting that plan I had unexpectedly quit my job and my entire income stream changed, along with my free time. I spent 24 hours crushed because I had self sabotaged my plan and my goals with one tiny (giant?) move. I slept on it one more time and realized that I had nothing to be upset about, I can still reach the goals I want to (though it might not be in the same timeframe I'd hoped for) and live the life I had been planning on if I adjusted a few things. I had a plan that I thought was perfect. The only thing I forgot to factor into my plan is that change will happen when you least expect it to, even if you think you are in control of it.
Take a deep breath. Don't be stuck on what no longer is. Move forward and look at the challenge as a way to grow, to learn how to change with the world around you. Keep going, because your surroundings aren't waiting for you to catch up.