Im sick of ugly black and dark skinned guys harrassing me?

hey guys i have a boyfriend who i love very much and am not interested in other guys im both scared and afraid of tamil, srilankan and black guys as some of them stare at me follow me and sexually harass me and shout abuse I don''t feel safe I always dress respectively and am a christian and have never encouraged any of these men but they frighten me as im in fear of being raped what do i do I was nearly raped by a gang of them i told them go away leave me alone i'm now to frightened to put a dress on in case they attack me I feel safe around white english guys as they don't bother me at all. what are the reasonable forms of self defence so that these guys dont attack me. I thought about wearing a wedding band or a crucifix but what is appropriate