Why is my daughter so anxious

She’s always biting her nails or fingers, she seems like she’s scared of everything, she always needs to be carried everywhere, always needs to be touching me, any minor cut or scratch she has a full blown hyper ventilating panic attack over (no exaggeration), she freaks out over everything, she seems like she’s crying more than she is happy or like she has huge meltdowns over random tiny things. I mean I took her to the beach and she had a meltdown over the water being too scary. she also has anxiety over poop. She poops in her diaper then hyperventilates when I have to change her. And refuses to go in the potty.

2 and a half seems too young to have so much anxiety. I feel like I’m a terrible mother. I hate myself I don’t know what to do. I have anxiety so maybe she’s just copying how I seem??? I don’t know. Just make it stop why won’t she just be happy and stop freaking out and stop being scared and sad all the time. Where do I go wrong when she was a baby. Will she ever be happy