Be proud of your hijab, don't let them get to you. Be the bigger person every time they ask you, and then they'll leave you alone. The fact is, they don't get it.

But I'd like to say that wearing a hijab is not something Muslim girls HAVE to do. It's good that you, that's fine. Not all Muslims wear a hijab, and that doesn't make them a bad Muslim. I just want to point that out.

Like morgan_michelle said, Always be proud :)

 This is the advice I will give you. Don't be afraid of what others say. I am a muslim girl, too. I also wear a hijab, like you. I went to this Islamic school during the summer for just a month. One day, I went up to my teacher and asked, "Why do people wear hijabs?" The way she explained it, so passionately, I decided to wear a scarf, too. I feel so left out! There are only two people at my school who wear hijabs; me and my best friend. It's a difficult challenge wearing a scarf, so I completely understand you. Just remember you're not the only one in the world wearing a scarf. You are not alone.

P.S If someone asks you about this next time, just tell them that it's a symbol for your religion. Hope this was useful!