I can do my Roundoff back-handspring on the ground, but I am too afraid to do it. Should I do it??

Well go with what ur gut says.. but dont be scared try it littile by littile u should pratice in a soft area just in case u fall example= carpet, tumbling mat, trampline , grass etc.. if ur to scared just have a spotter (person) watch you so you well feel more comtbale and wont have that felling... Hope this helped :0