All I'm saying, even if you are the most anxious or shy person, it can get better. With the right people around you and a positive environment, it's easier to be yourself.
It doesn't matter if you're not 100% confident because that's just unrealistic, but with baby steps it will get easier. Start with eating healthy, taking care of your body or getting a haircut, whatever makes you feel good. You can always have bad days, it's normal.
Making my bed in the morning has been very helpful for my mental health, because it makes me feel productive. That's what I've done every morning for the past couple of months. So find something that makes you feel good mentally, stay hydrated and eat well.