Is it normal I don't feel comfortable around black people anymore?

Normal, due to what has happened to you. In fact, I think it comes hand in hand with PTSD. I myself have been developing a phobia of African men, especially if they are in groups. I was concerned that this make me a racist, but it doesn't. I had a talk with someone, whose opinion I highly value, and I that yes, it's a stereotype, but where we live, this stereotype is unfortunately shone itself to be true. All three of us are women and women need to be more aware of their surroundings. True or not, this is not a PC belief so, I would be extremely careful with who you tell about this, least they twist your words and start accusing you of things. If you never got therapy for your PTSD, I think this could greatly benefit you. Another thing, is marital arts. Being properly trained is always a good skill to have as the whole body gets taught, so to speak.