So it is harder than you thought it would be?
In your mind, if it was meant to be, it should have been easier for you to achieve. Maybe you have had a few road blocks, such as financial trouble, not doing well on an admissions test or missing a deadline that you set for yourself. It's okay to fail. It's okay to fail more than once, twice, thrice, etc. It's also okay to be afraid and cry about it.
So how do you know if you should give up on your dream? Just know that you were given this passion for a reason and if you really feel that you have put a true effort towards this goal, don't give up just yet. Instead of going straight into your dream, maybe there are still a few things that the universe has to teach you first. Are you mature enough to handle the responsibilities that come with this dream? Have you actually experienced life before you thrust yourself into this all-consuming step?
When you look back at your life, would you really be happy living a linear life like you have planned in your notebook?
In physics, there is a difference between distance (a scalar quantity) and displacement (a vector). When calculating distance, you take into consideration the distance from your starting line per period of time. This includes every wrong turn, every backtrack and even if you walk back to the starting line. Displacement, however, only looks at the starting line and the final destination. All of your wrong turns, backtracks and complete start-overs are all forgiven, as long as you make it to your personal finish line.
So how are you living your life? Are you about to give up on your dream because your are afraid that you won't make it to your finish line? Did that wrong turn or setback make you question the course that you are taking? Setbacks can be so discouraging, but remember where you started and where you are now. If your dream was suppose to be easy, everyone would be doing it, but that is not the case.
You have come to far from that start line to just give up now.