Just starting

We're just getting into toddlerhood as first time parents, and we aren't having a great time. My daughter has quite the temper at 16 months old, not sure if that's all toddlers but. She is quite opinionated on what she wants to do and what she doesn't want to do. Really big feelings about a lot of things, which I know is normal, but she is hard to console once upset. Very picky eater as well. Makes me feel like a big failure when I try but fail to help her work through her feelings, or try to offer her nutritious meals that she refuses when I know she has to be hungry. Kind of just venting, I'm just trying my best but doesn't seem like enough and it's sort of burning me out.