Asalaamu alaikum sister,
I am a new revert as well (I became Muslim in June, alhamdulillah), and my parents don't allow me to wear the hijab either. I will be sure to remember you in my duaas.

Remember that it might take time for you to convince them. You needn't feel pressure to begin wearing the hijab immediately. Try going to the store with them and asking them to buy Kosher or halal meat instead of regular, or a long-sleeved tee-shirt instead of a sleeveless one. Making small adjustments such as these will help them to realize that you're still the same daughter that they raised, you're just making better choices. Also, you should ask them what their concern is. They might have a good reason why they don't want you to wear it. For instance, my parents told me that they were afraid it would be difficult for me to find work once I finish school. Inshallah if you take it slow, you will give your parents and yourself more time to get used to it.
Peace and blessings be with you, and welcome to our big happy family