Coming from the agency recruiting world, you deal with a lot of no's before you get your first yes. It's no surprise that the turnover rate is quite high for people who stay/go. Staying motivated, constantly iterating your processes, learning from and surrounding yourself with successful individuals can go a long way in terms on mentoring. Changing your view of a "failure" to an "attempt" and thinking of ways to try harder and be better will improve the quality of your work and ultimately lead to success. Not giving up, especially when the pressure is on.