Hey guys..new to the MFP world :)

Hey everyone. My name is Rachel and I just joined MFP yesterday.
Im 23, 5'10 and weigh about 5'10...last summer I was about 175..
Im kind of confused because some say 190 is over weight for my height
and then others say 190 is fine for my height. Either way I still want to loose about
25 pounds and tone up but I was just curious to know what any of you guys think.
The hardest part of dieting to me is giving up soda and eating healthy. I seem to give in about a week in.
Id love any hints or suggestions on how to stay on trackk and also make some good friends to keep in touch with about progress and life!