Ever Feel Like You’re Not Good Enough?

Does anyone ever feel this way? I see the way my mom acts with my brother’s girlfriend.. very jolly and what not. But when it comes to me, I feel like she doesn’t bother as much. My mom informed me the other day that my brother and his girlfriend are taking her abroad in October for her birthday. My stomach sank a little because I immediately thought “damn, how do I top that?”. It makes me angry to be very honest. My brother’s S/O purchased her first car a couple weeks ago and my mom let me know. She kind of brings her up in random conversations and it makes me feel insecure. I don’t know if it’s because I’m the only girl in the house (apart from my mom), so maybe I’m jealous? I don’t like to say I’m jealous because I don’t feel that I am. She stays in our house every couple of weeks because they have a long distance relationship. When she stays, it’s like a feeling of insane dread. I feel like I can’t relax in my own home?