Advice. Strict parenting created a nasty 3 y.o.

I am a single mother and I always told myself I will still be the disciplinary figure a child needs. I'm afraid I might have broken my baby. I'm always strict with my responses and follow through with butt smacks, pats on the mouth, and time outs. We also have good times, lots of hugs and cuddles, but I am afraid I took it to far.I am noticing she has a lack of confidence even while at home. For example today another toddler was dancing and I said why don't you dance too and she responded "I don't know how".She is also hitting and when asked why she hit she responds with "because I wanted to".I know kids are kids, but I fear my methods are failing me. I was an only child that listened to every word my parents said even as a toddler. I feel like I am unequipped for this.Is there some type of therapy we could attend together (or separate) that will give us both the tools we need to be healthy?Thanks. via /r/Parenting https://ift.tt/2yuLLxJ