I'm an actress ( theatre, film and TV) so required to get up early, work alone on learning lines to be 'off book', research, take direction, work under sometimes cold, uncomfortable circumstances for long hours for soemtimes little pay with people I have often only just met.
I've been doing this now for a total of 16 years (since I was a child) and have been lucky to be mentored and helped by lots of much older people with a wealth of industry experience, who have helped me understand that professional rejections are very rarely personal (there's just someone closer to what they have in mind or of a higher existing standing, not necessarily because they are 'better' or I am 'not good enough'),realise that the way forward is to be happy for other people's success even when you have little of your own, treat everyone and anyone with equal amounts of respect whether the are an A list movie star or someone 'running' on set, and to always go above and beyond what you think everyone around you wants and needs of you whilst maintaining a pleasant disposition, and help other people all you possibly can.
I have steadily climbed in terms of role size, production value and desire to be worked with because of this and I've just completed my first lead in a feature film which led me to be cast in a US TV series, Since then I've watched and learned that no matter what you do, you won't ever please everyone and that as long as I know that I have behaved correctly it's none of my business what anyone else's opinion is of me. I've seen that the happiest people just quietly go about their business doing their job and compartmentalise that from the rest of their lives, and don't get sucked into believing their own hype, so thus I feel quite prepared for the huge amount of criticism which is bound to come my way both professionally and personally. Inn other words it's the same for every industry- do what you do to the best of your ability, don't take things personally and be thick skinned about criticism where it's done purely for spite.