Staring at a blank canvas

I don't know why I'm always afraid of a blank piece of paper but I am. One reason I've never used oil paints because once it's on there you can't take it back. I tried to draw just now and I don't have enough confidence to continue or even start. I've always been that way it's the first mark you make on a clean piece of paper. I guess I've always been told I'm slow and not very bright that the trades would suit me better. I was never really encouraged to do anything in life. Whether it be my writing or drawing. I have a creative side to me I really do. I love to get lost in a good book or drawing. I don't know. It's amazing the amount of damage people can do to a child. I guess that is why I enjoy being with my husband he always encourages me to do what ever it is I'm doing. Well I guess I should get ready for work I'm really tired all of a sudden and not very positive.