That experience should motivate you even MORE to become a nurse because you would want more compassionate and dedicated nurses out there, not those nurses who lost their desire in serving people.
There are many dedicated nurses out there. I'm going to start working at a unit that I have been in for Management and Administration and they are AWESOME. They inspire me to continue working with them in providing the best care for their patients. They are warm and willing to teach me. You will encounter nurses like this too! Not only nurses that you encountered in the ER.
Good luck in your nursing career! You will be a great nurse since you love to serve others! :-)