When you are in a happy relationship is it normal to talk to your family and friends about how good and excited you are about your girlfriend?

"Normal", is whatever is normal for you. Some people certainly do go on about a new relationship, but most people get tired of hearing about it. You may want to talk about your latest love, but people will only be happy for you for a brief time, then they expect you to move on with life. "Normal" is being in a relationship. That means that since almost everybody does it we don't really want to hear you go on about it forever. "Normal" is sleeping well at night. But it's not normal to go on about how well you slept. People don't want to hear it.