I truly suggest you this reading. Even if you're going to be an entrepreneur, or not.
Here's few passages, but you'd better go to the article and read all the points.
2 - Family. Plain and simple, you cannot survive this journey without family. My wife is the reason I’m still sane and my source of happiness and fulfillment on a daily basis, regardless of the ups and downs this absurd roller coaster brings my way. My parents’ never-ending belief in my pursuit and initial angel investment has gotten us to where we are now on top of life’s savings and our team’s efforts. Don’t have a traditional family? That’s fine — find a family that fits your life’s circumstances. Family can take many forms. Find one that will be there for you in your darkest moments.
5 - Great friends. Friends are a lifeblood, whether you’re starting a company or not, but especially if you’re starting a company. They’ll be there to help throw your launch party. They’ll be early evangelists. They’ll be there when you need to escape for a bit and just have a cold one. If they don’t support you, they aren’t your friends. If they support you only once you’ve made it, they were never your friends.
6 - An ego that balances confidence and humility. You must be your greatest advocate and put yourself out there. All. The. Time. Make sure, however, that you don’t lose your humility. It’s painful to watch entrepreneurs, at any stage of their journey, who have lost any sense of humility. It’s a necessary balance. Few get it right.
16 - Gratitude. Find a way to be grateful, for everything. Ok, you don’t have to love the obnoxious driver who cut you off yesterday, but living your life with a sense of gratitude for life’s blessings, large and small, will have a profoundly positive impact on everything you do. I promise.
26 - Mentors. The wisdom you can gain from those who have gone before you is invaluable. Seek out mentors, put in the work to learn from them, and make sure they understand how much you appreciate anything they offer, most especially their time.