The pilot reported that he was intending to practice his skills in the local practice area since he had not flown in 18 days. Shortly after takeoff, he decided to stay in the traffic pattern and return to practice a full-stop landing. He stated that his approach was fast and the airplane touched down past the midfield yellow marking which designates the go-around point if the airplane has not touched down. The pilot reported that as he passed the yellow line, he was concerned that if he performed a go-around, he would not be able to clear the trees at the end of the runway so he elected to continue the landing. The airplane traveled off the end of the runway, through a barricade, and down sloping terrain where it nosed over. The pilot reported that he should have flown to the practice area to get comfortable with the airplane prior to landing and/or should have made the first landing at an airport with a longer, wider runway.