First off welcome to the forum, noticed it was your first post.
Second it all mental man. Sounds like a very similar situation that many people like my self whom are FFB?s get into. What YOU see in the mirror is not what is really there. After such a long time with your dedication at shedding fat it can be very addictive and you dont want to ever gain it back again. Fat that is. With any little gain you start cutting again never getting anywhere, just spinning your wheels and even regressing. Yup verg of or even eating disorder.
Fact is you need to work on a comfortable relationship with good food and a solid diet. It is apparent you are not eating enough to support LBM and are losing it, LBM that is. You will never get that six pack you want without having built it first. If you want a six pack you have to have one to uncover first.
At your weight and BF you really need to just work on getting a solid diet. Slowly upping k/cals over a period of time and concentrate on solid training based on compound movements. For now most of your attention for even years needs to be on Nutrition getting a healthy relationship with food learning how it effects you. Get over the whole getting fat thing. Don?t go straight for one of those super massive bulking cycles that will just add mainly fat but consistently raise your intake as you hit new plateaus, slowly building a solid body and relationship with food.
As you gain LBM the little fat you have will be spread over a wider area of MUSCLE. Plus getting your body out of it?s constant position of famine and storage may lead to you even being leaner. Once your body knows it is going to be fed it wont be so afraid of letting go of that fat that it is fiting to preserve in order to keep you ALIVE.
Another great tool can be a camera. Taking pics and viewing them has a weird way of letting you see what others are. That mirror has weird eyes.
So I say take these links read up and get a solid diet going in which you slowly gain weight, size strength, LBM.
7 Habit
http://www.t-nation.com/readTopic.do?id=459493
Foods That Make You Look Good Nekid
http://www.t-nation.com/readTopic.do?id=460638
The Carbohydrate Roundtable, Part 1&2
http://www.t-nation.com/readTopic.do?id=461157
http://www.t-nation.com/readTopic.do?id=459360
Fat Roundtable I&II
http://www.t-nation.com/readTopic.do?id=461947
http://www.t-nation.com/readTopic.do?id=461093
Massive Eating
http://www.t-nation.com/readTopic.do?id=460331
http://www.t-nation.com/readTopic.do?id=460327
M/E Reloaded
http://www.t-nation.com/...c.do?id=459429
http://www.t-nation.com/...c.do?id=459431
T Dawg 2
These and any / all by Dr?s JB and LL.
Then go with any solid w/o plan by any of these coaches that is concentrated on improving your WHOLE body and based on compound movements.
Build your self a solid base, eat more but eat right. You will be stronger, better looking and healthier. Not only that will be actually on your way to your goal of being lean and ripped by actually gaining weight.
It?;s a huge mental battle, hope this helps, and don?t hesitate to come back with any questions, comments, advice, or mativation,
Were here to help,
Phill