On the first sight, maybe instead of exchanging the queens, you could play Qc7 with potential Rd8, just an idea.
Nonrated School Club Game
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Wow, your school chess club really stinks. I think you should be the teacher. At least he should be above 2000.
7...dxc4? does not gain tempo. It just weakens your center control.
7...Be7 8. 0-0 8. 0-0 is far more reliable.
White can very easily just push with 10. d5!, and he already has more than enough compensation. Or do you have a reply? Because I don't see a good one.
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