Weight issues

I know a lot of people ask this, im around 5'7 5'6 maybe... and I weigh 54 kilos...
Is this healthy?
If not, im looking to change my eating habbits...

I'd appreciate any answers, clean ones

You're just on the border of optimal weight according to your bmi... you're an 18.8 (range is 18.6-25)

What does optimal mean?
And does anyone know a site where I can check on my BMI etc?

It means your scrawney shaun lol

just do a search for bmi calculator...

and optimal means a healthy weight (ofcourse this all depends, some people are naturally skinny, some people have a lot of muscle so they may be 'overweight' but fine...)