Welcome back. You know, I also was somewhat self-conscious when I started this hobby about 7 months ago. I hunted the most out-of-the-way places to make sure that I was alone, and would leave if anyone showed up or noticed me.
Since I started finding cool stuff, the hobby has become very rewarding and enjoyable for me, and my stigma gradually wore off. Now I really don't care who is watching or what they are thinking, because I am justified in my mind: I find cool and valuable items and I really enjoy myself.