It's like you're constantly dealing with this inner voice, this inner battle. So don't think that people who you thought have made it to, "the light at the end of the tunnel," aren't going through the same thing. The biggest thing that you really have to focus on is the voice that's in your own head. I deal with this voice all the time and I have to tell it to be quiet. It's a voice that asks you, "Are you sure you should be doing this," or maybe "you're not good enough," or it's just constantly asking you questions that take you more to a negative place. It's very easy to listen to your inner voice, the part of yourself that isn't so sure of how successful you might be at something.
The second thing is surrounding yourself with people who are either following their vision, following their dreams, or are attempting to do things that are out of their comfort zones. They themselves are going through the same thing. If you can relate to those people, you see that they are also trying. You may witness their successes and failures, which can be helpful to you. Surrounding yourself with entrepreneurs is invaluable, because you see what they are up against, the risks they take, and you see them trying to do things that most people are afraid to do.
While you are on this path keep those past connections. Interestingly enough, some of the past connections I made and maintained, some not even tied to the field that I am in have, led to things that created opportunities and projects for me. Projects I may not have gotten if I wasn't still connected to those things, groups, or people.