I'm amshamed to Be jealous of my mom...Plz help me?

Okay so like my mom is about to b 40 n she looks amazing for her age...Iike she could p off as my older sister,then we look like twins but the only difference is that i look younger and she has bigger then me...(my mom is a 34c and I'm a 38b)...when we're together guys pay more attention to her bcuz of her big s and I get jealous Bcuz mine are not even close to being as big as hers and im 18 so there not gonna grow anymore...and im scared to bring my guy friends home bcuz I'll know there gonna b like your moms hot and theyll flirt with her and I will just lose it I would probably do something really crazy...it's gotten so bad that I've had dreams that my boyfriend leaves me for my mom...now im living in fear that my dream may become a reality...thinking about it just gets me sad and scared then it makes me hate her �Bcuz Idk what I'll do if she were to leave my dad for a guy I had...in the end i always feel sorry for myself bcuz i feel like i have to compete with her...please help me�