I'm a new grad too - it's very hard and I've really only recently started to feel confident in my abilities.
Do you think the problem has to do with your particular ward? Eg. acuity, ratios, staff members? Some wards are definitely tougher than others in terms of the "grad experience". Or is it knowledge/skills based?
Talk to your Nurse Manager and if your hospital has a Grad Support department contact them. Maybe another ward would be more your speed. Maybe you just need a little extra support, or some practice developing technical skills. Don't be afraid to go to your in-charge with any issues, I've made a habit of updating them a hell of a lot throughout my shift, or bouncing ideas of colleagues.
Like, my patient had chest pain but the ECG machine disappeared and I couldn't find the anginine so I grabbed her and asked her to help me find stuff while I started to follow the chest pain protocol. If I didn't speak to her, I would have gotten flustered and missed some steps because not finding stuff just triggered that fight-or-flight response that all the simulations at uni couldn't prepare me for.
Also - general med is hard because there are so many conditions. I'm having a much easier time on my current stint respiratory/cardiology because it's 50% lung cancer, 30% COPD and 20% post-MI patients who are off telemetry. Maybe you'd do better on a more specialised unit where you can develop skills and more in-depth knowledge.
I'm sure you can do it! About a month ago I felt like I wanted to quit, but then I took my current contract and my confidence has increased a whole lot. I now feel comfortable and calm before shifts.