always over think skills and psych myself out

[tumblingbree]

last year i used to be almost fearless, like i wouldn't get scared about any skill and i would just throw it without thinking. I've been doing back walkovers on beam for about 2 years, and this year whenever i'm about to do them i over think them way to much and get really scared then psych myself out. I also used to love tumbling my now, but now i just get really scared. what is wrong with me???