Choose the mountain you want to climb: don't pay attention to what other people say, such as "that one's more beautiful" or "this one's easier". You'll be spending lots of energy and enthusiasm to reach your objective, so you're the only one responsible and you should be sure of what you're doing.
There comes a point in your life when you realize:
Who matters,
Who never did,
Who won't anymore,
And who always will.
So, don't worry about people from your past, there's a reason why they didn't make it to your future.
Many of us spend our whole lives running from feeling with the mistaken belief that you can not bear the pain. But you have already borne the pain. What you have not done is feel all you are beyond that pain.
Life is a gift from God, an unlimited series of opportunities to find the good in ourselves and others. There is good in everything, if we are willing to see it.
Mankind is drawn to the heavens for the same reason we were once drawn into unknown lands and across the open sea. We choose to explore space because doing so improves our lives, and lifts our national spirit. So let us continue the journey.