Guitar Strings Belt

What has the experience on the guitar from learn to play standing up?
I play the electric guitar only 3.5-ish months, taking lessons per week. And a few friends invited me to his team. Although repeat that to find someone with real talent and I want to play for some reason. In fact, I wondered, because I played all this time sitting, the amount of experience you need before you should try play up? Because I tried it and is rare, even with a guitar in place between my waist and stomach, something is just different, meaning a diagonal angle raise your right hand is a kind of scratching on the strings, the receipt by the law (because I play seated), and the guitar (and chains) are diagonal and feels weird, and how can I fix it?
We need practice time to build strength in your fingers, you can play while standing easier. Just do not quit!
Nylon String belt!!