While we are alive, we will always be one thing- ourselves.
Growing up, I personally never valued self-love because I never truly loved myself. I was always worried about the way I look, the way I was perceived by others around me, and even the way I acted. It wasn't until I fell into sadness where I was never fulfilled in myself that I had to start putting myself and my needs first.
Pleasing others is important, but you have to come first.
Showing yourself love and doing things for your mental and physical health may look different than someone else's version, but it does not make your needs invalid. I have grown up an introverted extrovert and have realized that I need my alone time but I value time with others just as much. Taking care of yourself includes all of the situations you put yourself into such as having that day for yourself and the days where you are just riding around with friends.
Exercise and good eating are also essential.
I grew up turning to food for comfort and validation which ultimately lead me to more issues. I have struggled with my weight and the fact that all the other girls were skinnier and "prettier" than I was. I am still in the process of showing myself that I can work towards being confident in my body but I do not have to settle to be the way that I am. Even if you're not trying to lose weight it is still important to exercise as it's proven to be healthy for your heart and your mind. It's also shown that when you're eating better you'll have a clearer mind and feel better in your body.
In all, you must learn about yourself and take into account your needs.