Middle child thing?

Anyone just feel alone sometimes? That’s me, I’m a middle child of two other sister. (All female) Luckily for me I rarely have the problem of stealing other cool items from them. However at time, I feel like the disappointment in the family. My mother says she has no favorite but I know that a complete lie. Rather I have grow up to be the third wheeler in my family like an outsider. I’ve done everything too make sure I’m on top and my parent don’t think I’m a disappointment. Things such as:

-Class rank top 10

-Dual Enrollment

-Honor/Ap classes (passes APUSH yay)

-Extracurricular (College peer counselor while in high school, Softball, Leadership, Chinese club, Art Club, Education talent search etc.)

However, my mom to be exact call me a disappointment and believe I’m not worthy in life unlike my older sister. Even getting in trouble it’s me that get punished more. Personally I feel like I haven’t had a childhood because I’ve become independent and have been till today. At time I feel like it take a role on me and just makes me feel bad. Does anyone else feel this experience regardless of middle child or not?