What is my issue?... serious question.

Ever since I was a kid I had a strong dislike towards my brother. He’s ten years older than I am. I’m 24. Well, recently I moved in with my mom because of a separation. He lives here and so I pretty much see him everyday. I spend a lot of my time trying to avoid him. It actually gives me anxiety. My son is also here and naturally, he’s trying to form a relationship with his nephew. Any encounter I have with my brother makes me feel guilty or angry at myself afterwards, mainly for putting on a front, pretending like I care to talk to him, when I don’t.

I can’t pin point any one main reason I dislike him. There are many many reasons as to why I dislike him but they are insignificant because they are from the past.

When I get around him I feel like a child, highly annoyed, its hard for me to be myself around him and it’s hard for me to parent because I shut down mentally ( i know very bad).

For those that are curious, some of the reasons I dislike him is because he’s lived with my mom for 7 years and never paid a bill (trifling) I’ve been here for three months and pay rent. He charms his way into using people. He told my ex it’s okay to hit women because they like to argue too much. He’s a creep, literally tried to have sex with our cousin. He doesn’t like to help my mom with minor things even though he’s lived here rent free for so long... these are just a few reasons.

I feel like I need to see a therapist because one persons presence shouldn’t bother someone this much. The problem is, I move in a month so it’s not in my budget. I try to google and YouTube ways to get over what I’m feeling but I literally don’t know what my issue is.

From what you’ve read what do you think is wrong with me? What are some videos or articles I could read that would be helpful to me?

I would like to add that I know I have a problem, because I sneezed, he said bless you and I felt so angry about it, I didn’t want to but I did. I tried to hold my second sneeze in just so he wouldn’t say bless you again. Maybe I’m childish.