I know the feeling completely. Vet school, all my summer externships, residency fellowship....I'm tired of it. I want my Big Girl Job, and I want it yesterday. It sucks, but life kind of IS about "selling" yourself. However, the problem isn't the selling, it is more about maintaining a positive attitude and liking yourself - it feels less like a drag that way. That's the way to keep from feeling like you're constantly fighting to get ahead.
Don't let imposter syndrome get to you too much. It never goes away completely, so you just have to remind yourself that you ARE awesome. Hell, I still worry sometimes that eventually someone is gonna find out that I'm not as smart as they think I am and they'll toss me out
I mean, I'm a fracking slacker who sat in the back and would surf the internet during class, how the **** am I here? I still can't believe I passed boards, I keep thinking it was a grading mistake somewhere and they will take it back. I still worry about being able to perform in this lab - what if I'm not as smart as they think I am? What if I let everyone down? Etc. You'e not alone