Middle upper lip bulges out over bottom lip, fillers don't help. What else can I try? (photo)

My center upper lip bulges out and overlaps my bottom lip. Bottom lip is also much wider than the upper lip. It's very ageing and makes me look miserable. I'm only 21 but have been mistaken for being in my mid 30's. In the past I have tried to fix the problem with fillers, but they only exaggerated the issue and made me look worse. They also left me with permanent asymmetry as you can probably see. Please help. I'm desperate for a solution. Picture attached below.

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