2 weeks ago, I was in the same boat.
My DS was exclusively formula fed for the first 3 weeks due to a very severe tongue tie. Once it was cut, he was able to latch a bit better, but we still really struggled.
I had been expressing prior to this, though, and it was so draining expressing every time he had a bottle.
I took my DS to every "latch on" or breastfeeding peer support group around - I managed to get to 5 in one week. This meant that he latched well at least once per day, and I really felt it helped me. I started by replacing one bottle feed with a breastfeed and went from there. When I don't have support to get him to latch, I'm still using nipple shields.
My DS has only been able to latch for 2 weeks, and I'd say he's 50% breastfed and 50% bottle fed.
Be kind to yourself - I remember how tough it was and I was really hard on myself for not being able to make breastfeeding "work" straight away.
Feel free to reach out - had I read your post 2 weeks ago I wouldn't have felt so alone.