Hugs at ya dear, I was baptised as a teenager and so I know the drill.
Many here on the board have found the perfect solution: move away, far away, and the family will never know you have 'left the truth' as long as you are careful.
DO NOT give them your address or a listed phone number you must tell NO ONE where you REALLY are. ( a post office box is better say your mail keeps getting tampered with) At least two someones here on the board moved thousands of miles away, (Jehovah's Witness Relocation Program) gave the family their address/phone number, and then had to do some fast explaining when the family sent the JW elders by 'just to check on them.' That is NOT good.
Keep your chin UP!!!