So this month I’ve been having anxiety attacks and intrusive thoughts about something bad happening to me such as someone beating me up randomly in the street, getting robbed etc

I just feel like nothing is preventing someone from doing harm to me or any other person, we often feel safe because of the fact that law exists while in reality nothing stops anyone from doing anything usually.

I’m not scared of dying or passing away, I’m just scared of the fact that someday something like that will happen to me because what are the chances I live my life happily without anyone causing me any kind of physical or mental harm? 

I’m scared of how I will act upon something like that happening to me (freezing or not acting at all) and that makes me question my own masculinity and general worthiness.. that makes me judge myself and makes me feel useless

My question is how do I deal with these anxiety attacks and thoughts that mess up my life and make me see everything badly? 
I’ve tried studying stoicism, cold showers, nofap, working out, talking it out..