Yes, it's your body and your life, so you can decide whatever you want to do with them.
If you are already pregnant maybe you should consider more carefully what to do. Some people say abortion is haram at all stages. Others think that it's okay the first trimester. It's really up to you.
If you are not pregnant, then, nobody is forcing you to have kids. You will be judged on the basis of what good deeds you have done in your life. Having children is not a good deed in itself if you don't take care of them once you make them. (I'm not saying you wouldn't take care of them, but if you don't want to have kids there is a possibility that you are going to dislike being a mother).
Also, there is always the option of adoption. Not only you would have a kid (since you said you like kids but you are only scared of child birth), but you would also do a good deed, saving a little orphan.