When I was your age putting on a pair of worn out gym shorts gave me a reaction, let along a pair of pretty panties. A lot of what is going on is hormones.
There is a sexual aspect to a lot of lingerie. The Victoria's Secret catalog wouldn't have sexy printed on every page that has bras and panties if this was not the case. I expect lingerie can help put many GG's in the mood and its also OK for you to feel that way about looking pretty and sexy. When something is new there is an excitement to it. Your reaction is a normal reaction especially if you link womens lingerie to sexuality like most men do.
However, the more time you spend in lingerie the more you get used to it. In time it becomes more of a function of what lingerie looks better under your dress, jeans or slacks and what lingerie you feel more comfy in. With time you will likely find yourself feeling about lingerie the same way a natal gal feels about her underwear.
