relationship advice on my suegra

alright ladies I really need some of yalls advice on what I should do here. okay so me and my mother in law aren’t really on good terms and here’s why. So my first impressions of her were horrible and idk maybe it’s just me but whenever I would stay the night with her son and we’d end up leaving the house (mind you I took a bag and of course I would leave it in his room). So one day she came in his room with me there and she was asking all these questions on where I got my face mask and where i got all these other things I had bought so she could buy them. I didn’t really think much of it until I realized ‘I never took out any of those things from my bag so how could she know I have them?’ and of course there was only was answer to that (snooping in my things). i didn’t really pay much attention to it, you know like I let it slide. so couple of months later I end up moving in and I bring a big box of things in there and our room was too small to have it in there, so I would just leave it in another room that no one used. Again we would leave the house or whatever and when we came home I LITERALLY CAUGHT HER GOING THROUGH MY BOX?! I didn’t say anything because it’s not like me to act out so of course I would say something to my boyfriend instead. all he said was “it’s her house she can do that.” is that okay ladies idk please let me know because first impressions are a big deal to me so it kind of stuck with me (it’s been a little less than 2 years now) also there was another time (keep in mind my suegra speaks only spanish and I understand it really well but i’m not good at speaking it) I came home from work and I would try talking to her in spanish and she completely ignored me. I felt so embarrassed. I ended up telling my boyfriend what happened and he doesn’t believe me? idk what to do. also me and her son have a kid together and she’s always making side comments about him like “oh he’s hungry” or “oh he’s tired” or “oh he doesn’t like baby food” and I get that she’s trying to give advice but he is my FIRST kid let me learn. Should i also mention that whenever her son and i are talking she always interrupts or talks over me and i think it’s so rude but she does it all the time. i honestly feel like she doesn’t respect me. idk maybe it’s just me, but I was hoping someone on here would give me advice. sorry if it’s so long. 🥺