If you are solving 3x3 by LBL for over 6 months I'd definitely recommend looking at F2L. You would be surprised how easy it is to get to grips with it. Just watch the videos on
http://badmephisto.com/f2l.php on intuitive F2L and that should set you on your way. You don't mention whether you are 2 look PLL/OLL etc so difficult to advise there. As mentioned get a good cube and just search forums or YouTube for finger trick videos.
Don't let being an adult put you off. I've started cubing in my 40s (after 30 years remission!) and I gain a lot of inspiration from some of the mature cubers here