I feel dead and empty inside but there’s nothing wrong with my life, how do I fix this

A bit of background, I’m a 32 yo female, recently finished school (PhD) after my whole life of being in school. I left my family and country to have a better life and now I have a job, I live with my boyfriend who’s amazing, people are work are great, my job (engineering) is somewhat boring but it has potential and pays well. HOWEVER I’ve been feeling frozen and empty inside since I finished school and started work. It seems like nothing excites me, I don’t look forward to anything really, I could die tomorrow and it’s fine, like I just feel disconnected from life and I don’t know why because my life is so much better than what it used to be, I have everything I need and I have people who love me. School was torture and my research included a lot of heavy mental and emotional and physical labor not to mention I was broke. Now my life is so much better but it’s almost like that misery and suffering was giving me some kind of direction and purpose and hope???? I used to cry everyday though! Now I don’t, I go on with my life, work, sometimes workout or dance, spend time with my bf, but I can’t understand what’s missing. I feel a hole in my chest, like an emptiness that nothing fills. I just don’t have the same zest for life, I keep finding myself calculating how many more years of life I have left and feeling like best parts of my life are over and I should just wait for death. Why am I feeling this way? What’s missing? How can I fix this? Does anyone relate?