There is actually more calcium per ml in skimmed milk compared to full fat, just to clarify. The reason you are on full fat milk though is because you need the nutrients within it to gain weight healthily.
Its going to take many months/ a couple of years to increase your bone density via treatment [diet & sunlight/supplements/medication/exercise] by enough to show on a further bone scan.
Being 20 though means you have a good 5-10 years to build on your calcium stores as your bone mass peaks in your late 20s. Osteopenia means low bone mass and you still have an opportunity, being the age you are, to prevent osteoporosis and increase your bone mass.
The more bone mass you can add the better, the more calcium and vitamin D you can give yourself in the next few years the better your chances of preventing Osteoporosis later in life. There are many treatments available, this condition isn't something that cant be improved, you can make you bones much stronger, try not to write your bone health off.
Did they let you know your T scores? As sometimes they start treatment then do another bone scan, say, 12 months later with the hope to see a figure closer to 0 on the next scan.
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