You don't have to be a "member" to fast.
Since this is all new to you, you should start slowly. Do what you can, knowing it's not yet required of you.
Also, most importantly keep in mind that more important than fasting from various foods, is being introspective, and trying to live as the best Christian one can - at least for the duration of Great Lent. You never know, one might get in the habit and keep it up longer. My grandfather gave up smoking (pipe) during Lent, and never picked it up again.
Try to volunteer your time, give to charity, help anyone you can...pray more...be kinder...more patient, etc.
...and as always, talk with your priest. He can help you out.