The negative will always be, so will the positive. So which one are you going to choose? Being negative and listening to it will NEVER fill you with joy and excitement, but positivity will. If you have been listening to someone else's negative opinion of you, and believing them, you can rewire your brain to think the truth, which is that you are important. You have the choice to make beautiful things in this world and increase your good energy.
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Your Opinion is the Important One
You already know you are valuable. Love yourself and speak kindly of you. Whether others are speaking kindly of you or not, it's what you insert in your mind that your mind will believe. The more positive you think of you, the more positive you will be as well as not allowing someone else's opinions in. Why listen to them? They are people who don't realize they are valuable as well. People who know this, treat themselves kindly and others.