What is ideal weight?

I think this is a question that many people ask themselves but to be more specific going beyond BMI does this actually vary between individuals. 

I am 5.8 , weigh 148 pounds and have a bmi of about 22.5 but i am just very average and havent got a clue what I should aim for. 148 sounds a lot and my weight fluctuates a lot and i haven been a bit on the heavy side but never obese and never slim. i have already lost like 10 pounds but I am not satisfied with my body yet and want to make more improvements.  Does anyone else have this problem, and what do you aim for, increasing muscle, working out more? So i am beginning to wonder if there is such thing as an ideal weight or do we just have to be satisfied at some point with what we have? 

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