Part of me wants to blame this on the fact that I'm an introvert, but if I was in therapy right now I'd say that a big portion is because I've always questioned my self-worth. At an early age I convinced myself that I wasn't worthy of people's time or love. I didn't think I deserved to be happy, so I said "no" to all the things that scared me.
I’ve been working on myself a lot over the last couple of years, and things have definitely improved, but I still struggle with investing in myself. I've since realized that I have to say yes to myself before I can say yes to anyone else in my life.