Every successful person knows that every single path that you can possibly take to get to where you want to be is going to be hard. That's just a fact of the reality of this earth. Struggle, pain, misery, and frustration are signs that you are A-on the right path and B-making progress.
Nobody that is where you want to be has gotten there without these struggles. Without the bleeding, without the pain, without the depression, without the misery, nobody. So what makes you think that you're going to be able to be that person that gets there with none of those things?
If you want to be something big, you want to dream big, you want to be something great, you are going to have to learn to accept the struggle as part of the recipe every single day.
You need to look yourself in the mirror and ask yourself what you are willing to do to get what you want, and if the answer is "whatever the hell I have to," you will probably get there in time, but if it's anything less, you won't, and that's just a fact of life.
No matter where you are, believe in yourself, keep working, and keep going. Success and fulfilment are going to come from your unflagging ability to believe in what other people call "impossible".
It's going to come from your unflagging ability to get up each day and work towards things that maybe you don't know where they're going, maybe they're not getting you what you want right and play.
Maybe it's not easy. Maybe it is a struggle, but it is through that struggle and that effort and that dream and the desire that you get there. The hero is a hero. You have to believe in yourself and have the ability to genuinely express who you are.
If you're doubting yourself, the only way through is to take more action, and with more activity comes more competence. With more competence comes more confidence. The more you learn and try, the more you master and develop, so go out there with that.
Yes, let the doubt be there, but do it anyway. You can have more than you have because you can grow into more than you are. And of course, the other side of the coin reads, unless you change how you are, you'll always have what you got.