Your tone certainly suggests that you find this to be something of a conflict, so I'm assuming you might like some suggestions on how to manage things. A lot of us here have gone through similar experiences and done that if that is what you want.
The kind of "addictive" zeal for collecting feminine clothing you are experiencing is common for people who have repressed a desire for a long time in the past. I suspect having and wearing clothing you find feminine counters the male persona you've probably created for yourself. This desire is often connected with sexual desire. But it's OK and can be managed, if you want.
If you start wearing the clothes you're buying a lot of the time, I suspect your desires will settle into a more practical level. I suspect your desires to shop fluctuate back and forth now, anyway-- in conflict with your desire to oppress them. If you stop oppressing and just make a place in your life for it, things will settle down, I believe.
You do need to explore your feelings and decide what you want to do. There are a number of ways and people manage happily with all of them. Your choices look something like this: a) Closet crossdresser who collects things and dolls up regularly at home, b) Public crossdresser who is not concerned about passing, so limits times and places out, c) Passing crossdresser who likes to divide time between living in masculine and feminine personas, d) Transitional, and aim toward living full-time as a woman.
Once you decide how you want to play this your passions will become easier to deal with. It's just a matter of working out the details. Good luck with it.
EDIT: Oh, there's one other option I didn't mention. You could decide to incorporate femininity into your masculine lifestyle as an androgynous person. This option is seldom appealing to the passionate crossdressing enthusiast, though, but it's an option you can add to the others.