Does my mom love my brothers more???its a bit long but plz answer?

So i have two younger brothers 5 and 10 years old im 14. Everytime i go out with mom and bros shopping she gets my brothers everything they ask for. There were obviously many things i liked too but didnt ask and when i dinally come across somthing i cantget my eye off she tells me to buy it with my own money. My dads store isnt makin much business so wen i ask her y i have to pay she uses that excuse and the excuse about bad economy. I know thoseare both true but i hate that she tells me about our financial problems!! I wanna live my teanage years hapy not guilty whenever my parents get me somthing over 5 dollars (which is Rare with my mom and im embaresed to ask my dad cuz he gives me a 20 dollar allowance every 2 or 3 weeks)!!! Also i wanted to go to a camp for my birthday which was a week in july annd she said no we rnt makin money. The next day she signed up both my. Brothers for camp. Now i getting braces on friday and my mom was te one convincing my dad to pay and stuff. Me amd jer were just talking about fun things and she opened up the envelope woth the bill and screams "oh sh**!!!!!!!" and she is like all pissed and mad so now im feelinf so bad i need braces. Idk wat to docanymore and tpday she told me she never wants to buy things for me. She disnt even get me the folder iwanted today ot was 50 cents and she told me to pay for it!!