Am i overreacting

So my period came right, and i asked my mom to buy me pads (we don't have tampons in our country), and she kept giving me excuses like, "im busy","i don't have the money maybe tomorrow",and i went on that day without pads and i had to change my pants 10 times, and then i found out she went drinking this day, and i asked her if she bought some pads and she said "i don't have the money", and i was mad because she had the money to drink but didn't have the money to buy me some pads that would only costs like 3.50 ,so i yelled at her telling her that she was ignorant and selfish, she asked me what was going on with my behavior and i just told her to shut the fuck up and slammed my door on her, was i too harsh? I don't feel bad but in some way im feeling a bit sad