Hi Jen, Sorry to hear you are not happy in your relationship. It is difficult to give an advice here: it all depends. Maybe you are in the root if the issue, maybe him. In your post I read a lot of self-criticism. While sometimes it can be good and healthy, sometimes it is just destructive. Have you told him how you feel? Are you afraid of revealing yourself to him? 8 months doesn’t seem to be too short to “have right” to open up.
If your attachment style is unsecure, there is nothing wrong about it. It is what it is. Maybe you just need your “minimum” which he is not able to give. Maybe you could identify, literally write down for yourself what you are looking for in a relationship (as detailed as possible). And then to see if this person is a good fit for you. Now if you see that your needs and expectations are unrealistic, then you might want to work on it.
We should not feel ashamed for the way we feel. While there is always place for the self-growth and self-improvement, we don’t need to be someone or to pretend to be someone we are not. It never helped me in my life.