Body issues

So daddy informed me he’s putting money away so we can go on vacation. He asked where i wanted to go mind you he’s shooting for January which means where we live will be like 25 degrees (we live in jersey) so I chose the Bahamas, I’ve never left the state’s and he’s never been on a plane could be interesting. But any way that means I have 6 months to lose 50 pounds. Anyone have any suggestions on how I can about this? Please help me. I want to be able to walk around in public in a bathing suit and not wonder if the people are looking at me like gross put clothes on.  Serious body issues for like the last 8 years “( it literally depresses me.