My dad chose his wife over me?

im 18 & my dad got remarried. i havent talked to my dad in a year & made a choice to cut him off. he has never been there for me & he basically abandoned my mom & I for another woman. my dad wont pay for my college, he wont help me get an apartment, he never buys me any clothes, & he wont spend any money on me. he just bought my stepmom a new car & diamond earings. i am extremely jealous & hurt. my dad is a lawyer & he doesnt even pay enough child support. im not saying its all about money but it would be nice if he could just take me out as a daughter & make me feel special. why does he blow all this money on my stepmom & cant help me out with money? HELP!!!!! MY DAD OWES ME