Idk what to do

It feels like I’ve just now gotten my life together; I passed all of my classes this semester with good grades, I have a boyfriend whom I love and enjoy where we’re at right now, and I have a job that I enjoy. I finally feel truly happy and content with my life. But there’s this deep feeling inside of me that thinks there’s something wrong. I can’t shake the feeling that something bad is happening and that I’m not in control to fix it. I also feel alone in my thoughts, even when talking to friends and family. Is that anxiety? Depression? How do I fix it?