Sounds like you had some depression and anxiety issues prior to use? It would be hard to imagine how a one time 6 wk cycle (I am assuming beginner's/low dose?) would have long term problems by itself. Yes dbol does aromatize and could have hastened your growth plates closing, but at 19 you likely werent going to get much taller anyway. To any teenagers reading, this is not to say this was a good idea. You will benefit more from AAS waiting later until system is more mature, natural growth factors have peaked, and to allow for years of training before (this maximizes your gains later). But for you, that is water under the bridge.

Libido is much more complicated than testosterone; and with you having bloodwork confirming ok levels and continued gym progress I would say look for another cause.