Critically to think

My prior knowledge of critically thinking was during any discussion or decision making first I looked things very deeply as I want nothing should go wrong. I take out points what if not, negative most of the time. This leads to multiple thoughts whether I should go ahead or not and some where emotional  aspects were also affecting. This affected my decision making. I cannot make decision.. I generally used to get affected by people. Generally I ask others to help out to make any small decision also. I was lacking in finding out or generating evidences why it makes me say that thing or feel that way. I was not able to give or put my logical arguments against it. With help of this critically thinking classes I started  slowly looking for  strong evidences, reasonable logical arguments and then try to make decision.