What should my ideal weight be?

makemewannadie

I'm 5'11 and currently 159lbs... the lowest weight i've been was 110 which I know was too thin, but since putting weight on the past two years it feels wrong on my body (it's mostly gone all on my hips and thighs!) I have a small frame/i'm not 'big boned' nor am I muscly or very strong, but I would like to get 'fit' not just 'thin'. Any recommendations on how to start out getting stronger for a weakling like me?
I'm aiming for 130/135- does this sound right to you?
Thanks in advance