The only question you need to ask yourself is WHY. Why are you doing it? If it's something you fully believe in and you think you're meant for it and it's your drive and purpose, then don't let anyone hinder you. Those failures may be a thousand, and they tell you a thousand different ways of the wrong way to do it. Now you know better.
But if you're only doing it to please others, then yes, that's the time when it will be exhausting and too tiring. It's your life to live. Don't let someone else other than you hold more power over your life.
Life isn't a movie, but it is what we make it. Live for yourself. Make your life count first for yourself. When you have enough love for yourself, then and only then would you be capable of loving others with greater chance of not hurting you both.