I’m of marginal value – is there any way to become a dateable person?

I'm 40 years old, male and have never had much self-confidence (or really any). I generally think self-confidence is not something you can really fake – you either think you are worth something, or think you are trash. No matter how hard I work (good job), how financially stable I am, how fit I am, how well I dress, my general outlook is if nobody is expressing interest in you, than you are a product nobody wants. We call things that nobody wants worthless trash. I've been in therapy for years but I think it's mostly half-hearted attempts at deluding myself to reality – it doesn't really change much.

So, my biggest problem that keeps me in the trash category is that I'm below average height and I have several facial features that are not of what I consider to be the standard for attracting women. Some people have told me I am handsome, but I am pretty sure they are just lying to me (keeping up the social contract of being dishonest out of kindness). I talked to an expert who indicated to me that women would never find me attractive because of some facial measurements, and so I have worked that into my package of flaws.

Not sure what I can do at this point – I'm rather lonely. I gave myself 6 more months to try and find someone but I anticipate it will just end up being another deep personal failure to add to my record.

Any help would be really appreciated on which direction to start.