Mothers boyfriend problems-read as much as you need to answer the question?

i was sitting down and my mother boyfriend who lives with my mother but not with me comes into the living room. the Tv was on showing hotels, a man on Tv says that it is 60 Gbp a Night to stay in this certain hotel. as a teen i do tend to make mess. (like leave food lying around but i do my best to get it up but at night it's hard to see it on the floor even with the lights on ) my mother stays up the road at his house. anyway so he turned to me and said " see they won't have you making mess they would just throw you straight out " i'm 18 by the way and i know i am classed as a lodger but this is my house (through i don't pay rent as my mum says i don't have to ) i also have Agoraphobia. he seems jealous and taking advantage over me because of my condition. he isn't like this with anyone else. my mum argues with him too but with my mum he doesn't really take anything seriously and only jokes with her. my mum is serious through but with me all arguments are took serious because of me being a man i suppose and the fact he has a grudge against me. it's like he don't even treat this as my house and this is some place where i am just resting or something until i get back up on my feet, like he wants nothing to do with me, even when he makes cups of tea he asks my mother if she wants me and then goes does anybody else want one when they is only ME here, it's like he don't even want to say my name. he also backstabs me to my mum behind my back and says that lazy bastard won't do nothing and calls me all the filth. i am trying to break free of my condition and currently looking for a job, because he is belittling me and don't care about my condition he is like WELL DO SOMETHING. he don't force me to get a job but he because he thinks its his house, he thinks he can tell me what to do... leave you shoes on until you go to bed or open the blinds to look like you in or someone will break in why we gone just to benefit and get them outta trouble (mother and him) and if i never do it. he always argues over the littlest thing to the extreme and is very egotistical . always brings cops into it and i can get done for this and that. even over the mess i make... says council can evict me and they would shout at me etc. he has 4 kids of his own but he likes to separate them from me. he even said he thinks they better than me. when he argues at his kids they not as strict, one is few yrs younger than me but not much. when its me through he always brings legal issues into it and tries to make sound mature and old and that i should be living somewhere else with a gf and no one would want me etc.