mom tries to control everything I do

okay so im 18 and I just finished high school in july.I’ve been looking for a job but no lucky yet.so I dont do much for now,but I am going to sign up for school soon.I recently introduced her to my boyfriend a month ago.I’ve been with him for four months but we’ve been friends for 2 years.I never got to bring him over until recently because he had been in Alaska visiting his mom.well my mom seems to like him..as this weekend she asked him to come with us to a little family get together for my cousins birthday.well…he slept over Friday and Saturday because they were his days off from work and he lives kind of far so it would be a hassle to be driving back and forth.he slept in the guest bedroom which is downstairs away from all the other rooms.well..we were watching movies kinda late at night and she had me to go to my room at 2:30am because she couldn’t sleep comfortably cause we were down there alone.but I don’t understand why..im not stupid.im on birth control for heavy periods so when we have sex I’ll be protected.I wish she would just let us be.I feel kind of embarrassed that my mom acts this way..its kind of like shes bossing him around too,like telling us when to go to bed. also,joe wants me to meet his family soon and since he lives kind of far and I don’t drive myself he would want me to sleepover..I don’t know when I should ask my mom if I could stay over.he didn’t give me a date or anything..I guess he just means soon.should I wait a few more months to ask her if I can stay at his house?also when he comes over to hangout..she makes him leave at midnight.I wish she would just let him stay longer.how do I talk to her about all this?I’ve tried and she kind of just ignores me..while she watches tv..or I tell her “mom why don’t you let him stay late?” and she’ll reply with something like “cassie.you exaggerate.I let him stay late” like I don’t know.doesn’t really take any of my questions seriously.she used to let my sisters boyfriend stay the night in her room when she was 16..why wont she let joe?because she just met him?has anyone ever had a problem like this..and then your mom changed?this really bugs me…