Transition From Corporate Finance

Hi guys...long-time lurker here. I'm looking for advice on how to transition from corporate finance (FP&A role) into investment management. I graduated a year ago with a 3.7 GPA from a target school, but ended up taking the corporate finance role as it was the only offer I had.

However, I'm pretty miserable in my role and want to transition to investment management now without waiting several years to get my MBA. I'm networking with alums at companies like BlackRock and State Street now hoping to get an entry-level role. Am I aiming too high or should I look for boutique firms that will more readily accept someone from a less traditional background? Is it even likely for me to make the switch out of corporate or should I just tough it out and wait to get an MBA?