Welcome benefatual to the LD4all community! 
When you get lucid at first, the realization can make the dream unstable, and things like feeling your real body can happen, therefore you have to stabilize it a little, and focus only on the dream body.
Looking at your hands is a very powerful way, or you could get more engaged with the dream senses by touching and rubbing some dream object, for example. After you do that, and the dream becomes pretty stable, then it pretty much behaves like a normal dream, so it becomes a very natural experience that can last for a long time (even an hour or more!) while you are perfectly lucid 
If you want more advice on the subject, you could have a read into the Guide to prolonging LD’s or the Dream Control Training Course we have in the Knowledge Base.