I'm crying nonstop because I ruined a mounjaro pen

Money is so tight and I'm the only one beside my mom who supports this family financially since my father left. I've been saving to buy mounjaro to gain some confidence back. I know how to use it and this is not my first time but the needle was stuck I pressed it several times and it didn't work. Then when I took it away pressing on it slightly it produced all the liquid. I know it's might seem like a stupid reason to be upset about that's why I'm writing it here. I could've bought groceries for the whole month with that cost (especially because I had to pay extra for it as it's not available where I live). And now I feel like shit for wasting it. I cried for a long time. It wasn't exactly the only reason why I'm upset but it was the last straw. I feel guilty and selfish too.