How many times have you accomplished something that at first you thought it was impossible? Often just thinking that something is impossible keeps us away from doing that. You have to believe and fight against all the things that are holding you back. Work towards your goals, work towards accomplishing the all the things you want to. You will see the results.
Saying “I can’t do that…”, “That’s not for me…”, “If only things were different…” are the things that are keeping you from doing what you want to do.
Sure, you will sometimes fail. But that doesn’t have to keep you from dusting yourself off and trying again.
Keep your head up and try try try until you succeed!