New, but not really

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Hey guys!
I'm 23 and I'm from Chicago. I'm new to MFP, but definitely not new to weight loss. I've been trying to do this since I was 16. I'm just trying a different approach this time: reach out to people who get it for support and hopefully support others in the process. My biggest issue is self-motivation, but I'm getting better at it. I signed up for the Rock 'n Sole 5K in Milwaukee on June 23. Anyone else doing it? I've never doing anything like this so I'm really excited. My weight loss goal is 51 lbs. :D
Anyways, just thought I'd say hey! If anyone has any advice or anything, I'm all ears!