Just a quick note to say hi! And dont give up. Just focus on improving your swiming and dancing by practising more. I am the same height as you and i only dream to reach your weight goal..
The weight is not the problem here... You are fine! So like i said just focus on your sports :) and forget that weight machine--they are just numbers! I know, i ve been throu it-- if you let it control you, it will take your life. Believe me, you have nothing to obsess about, physicallu you are just fine! ;) i hope it helps. :)