i bought minecraft and i cant play normal version of this game,why?
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Could you provide me with some more details regarding this issue, as I'm finding it difficult to understand what the problem is. Is Minecraft in demo mode after purchasing it? Are you able to join server? Any additional information would be greatly appreciated.
Please check out this help article: https://help.minecraft.net/hc/en-us/articles/360029643892-Can-only-play-Minecraft-demo-Java-Edition-
If that doesn't help, please contact Mojang Support.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki

I bought minecraft java edition from mum's microsoft account and then we registered the game to my account and it redirected me to the normal minecraft site where I could change the skin. There it kicked me out after choosing the name. Only later did I try to install minecraft from the link provided in the mojang email, but nothing worked anymore. After installation, "game purchase" still appears. I lost my mojang account and PLN 100. Can someone help me?

Thank you for your report!
We're tracking this issue in MCL-16570, so this ticket is being resolved and linked as a duplicate.
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Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki
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Probably this is because you are playing with your Microsoft account and not with your Mojang account. Try to change the account from the settings.