Welcome, Free,
Just wanted to say that I admire your awareness of the potential for trouble if these issues aren't properly addressed. You don't seem to be looking at all to cast blame, only to sort this out, and I think that shows alot of both grace and courage on your part.
Right off hand, I can't think of any specific reading material to recommend, but it does seem to me that what you're seeking is an identity of your own, apart from parental expectations, and that is certainly a very natural, healthy thing. I have a 19 year old daughter who is in a similar process at this time, and for her, attachment to her significant other seems to have replaced previous parental attachments. In other words, sometimes we move from the frying pan into the fire when stretching our wings to be who we are and not someone else's idea of who we should be. At that age, I did the same thing, and I now wish I had devoted my attention to what and who God says I am, instead of trying to create some new identity of my own. Woulda saved myself alot of anguish.
Free, I don't think it would be disrespectful at all to engage in a group therapeutic situation. I'm thinking that you're living at home and are concerned about what you'd tell your parents you're doing? Well, you could choose to look at it as preventative therapy, rather than remedial work... and present it as such. It's amazing what a little change of perspective can do for attitudes and responses both. I hope you'll share some more of what you're experiencing as you're able. Many times I think that simply via talking these things out in a safe environment, we are apt to hear just exactly what we need, if we can sift through it all and let the golden seeds take root.
Best wishes,
Hope