Why does my face go red?

When ever i talk to girls my face goes red. Its really wierd cause my face goes red and i cant even feel it go red. So now its really bothering me cause i heard girls are starting to tell other people about my face going red

You just get nervous, that's all. When you are about to talk to a girl just explain yourself and that you're nervous. She'll probably think it's cute. If you want to change it, just take deep breaths and calm yourself before talking to a girl. Good luck!