How to be happy.

Tonight I'm going to Garth Brooks concert. I can't wait but then again I'm down and out. All the people I'm going with are happy go lucky and I'm like i want to stay in my room and cry. I'm getting tired of wearing a mask I use to be happy go lucky and I'm just lost. It's hard to go to a friends place and all they do is ask me are you ok you look sad. I always answer no I'm just tired or makeup is bothering me. I don't know what I'm saying I'm just tired of being sad and people asking me. I'm just done with life.