Losing the battle

I am deliberately exhausted. I am without a doubt lost when it comes to my daughter. How do moms do this without yelling, screaming or pulling their hair out? I love her, I want her to act right. I want her to listen to me, but everything I say to her just makes her cry. Saying no "kinda" works..and I use that word lightly. She stops after I say no a few times, but when she wants something that's when the horrible mean little baby comes out. She scratches me and pinches me, she throws herself on the floor kicking and screaming. I ask her what she wants and of course she goes to the freezer and points to the Popsicle . Of course I can't give into her demands, so I simply tell her no and then ignore her sobs and screams. It is taking a toll on me though, I want to break down and give into her, I have a few times and maybe that's what's turned her like this. But now that I am trying to enforce that she can't have one yet, it seems like it never ends. She cries and cries and cries until she finds something else to cry about..I just want to run away and scream. I feel like crying right now and I just put her down. What am I doing wrong? How do I fix this endless battle with her. She's not even two yet and these tantrums I'm afraid will only get worse. These are the days I feel like I made the wrong choice, these are the days I feel like a horrible mom. The days I just want to lay down and do nothing, I just can't handle it, I am so tired and scared because I'm afraid that everything I do is wrong. I need someone to help me..Along with Andrew telling me everything I'm doing wrong, it makes me want to jump off a cliff. I need support, not someone tearing me down. Isn't he supposed to be that someone? I feel so tired..all I want to do is cry and sleep. Blah...tell me it gets better...