It doesn't mean you won't feel irritated, annoyed, or fatigued from time to time. Doing what you love might sometimes entail doing things you don't want to do, which isn't always a negative thing. Because, in the end, the things you don't like strengthen you and bring you closer to the ones you enjoy. So, in other words, do what you love, even if it isn't exactly what you thought you were going to love doing. It also doesn't mean that if you love one thing, then you have to love everything related to that thing. For example, if you're a musician, this would mean that you have to love eating, drinking, sleeping, etc. If someone told you that you had to choose between these two things, then they are not giving you all the information you need to make an informed decision. In conclusion, do what you love, because it is important to find something that makes you happy every day of your life.