Hi Kathleen, I'm sorry you are feeling frustrated. I think this might be a slightly different atmosphere than most message boards because of the shear number of members here. I believe its over 130,000 registered members and then hundreds of guests browsing at any given time. With that amount of members its impossible to keep up with everyone and know who is new or not, although we do try to make everyone feel welcome and answer questions when they are asked.
My best advice is to just keep jumping into posts and people will start to recognize your name and learn more about you as you interact. I know it took a long time, maybe even a year or more before I could start to keep track of different people and get to "know" others here. I posted far less at that time though which made it harder. Once you get in the flow with things and post more you'd be surprised at how fast you start to meet people here. It also helps to find other sub-forums in topic areas you are interested in. I hang out a lot in this forum, in Special Needs Parenting and Frugality and Finance.. I find I have a lot in common with the girls who post in those forums and I have an easier time connecting. Also check out the tribal forums too!
There is a "Pleased to Meet You" forum up near the top that we check to welcome new members too. Since it is such a huge community its easier if new members posts a quick intro there so we can "meet" you and help point you in the right direction for forums and such too. That's where we do the welcoming.
Please don't feel invisible, its just a large community and its extremely hard to keep track of everyone so its not intentional. Anyways, welcome. I see you've been here since 2008 so I guess it should be a "welcome back" instead.
Oh! And another tip, it makes it much much easier to keep track of people if they have a signature! I recognize people by the names in the signatures and the combinations of smilies used. LMAO.