How do I tell my girlfriend I don't feel appreciated?

I have been with my girlfriend for around 8 months now :3
and it's been going brilliantly, however the past 2 months have left me feeling rather low and not Appreciated in the slightest. .. I tried bringing it up.
but each time I try she cries and gets angry... so obviously I feel like a dick and leave it :/

I'm just a bit stuck on what to do
How do I tell my girlfriend I don't feel appreciated?
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