Trading in my Mustang Ecoboost for a GT?

I rececently bought a 2016 Ford Mustang Ecoboost Premium with Performance package it was 36,500. I gave 12k down and am currently financing 24,000. I'm regretting my decision and want to trade it in for a GT Premium. I've only had it for 3 months and it currently has 600 miles. I want to know what to do. Should I trade it in now or should I wait few a months?
Added (1). I'm also 20 so my insurance rates are high. I'm turning 21 in 3 months so my insurance rates should go down a bit. I'm currently paying $400 on the car and $315 on insurance.

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