How can I get out of this?

Today I let a sales lady talk me into buying a purse I knew I didn’t want. It is so annoying how I can’t just say no. I want to be a real estate agent/real estate lawyer. And I can’t even tell people no. I tried so much to tell her no and she just kept presenting new purses for lesser prices. I feel so stupid. How can I ever succeed like that. How do I get out of it? To make matters worse I know my grandma probably thinks I’m an idiot for buying something I didn’t want. Please help me
How can I get out of this?
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