Yup, that's where the religion puts you: all alone. It's deliberate; people who don't have the skillset (by design) to make it in the world will run right back to the organization, where they might also feel alone and unable to share their true selves without fear of ostracism.
Look, I understand wanting to get married, wanting a relationship. But, what would you be bringing to it? You're working part-time and still living at home. People are looking for others who will pull their weight in a relationship. Those who have careers are attractive. Those who can take care of themselves independently are attractive.
My first advice would be to get a "real" job, one with benefits and enough income so you can begin supporting yourself. This will build self-esteem and help you "find" yourself. You seem lost, as if you don't really know who you are, and, therefore, what you want. This is normally a task started in adolescence and finished by the early twenties or so.
It's no accident that JWs are stuck at that stage. Every part of life has a pre-formed set of ideas/ rules surrounding it: marriage, family, career, time-management, beliefs. If you don't think too hard about it, you might actually believe that those are your personal opinions, too. But, when you do think hard on it, you realize that you really don't know what your personal opinions are because you've never had to think about it. You wouldn't recognize a personal opinion if hit you on the head!
So, to begin to get to know yourself, you have to give the gift of time to yourself. Time to do things that will help you find you. Most people do this through career to begin with. Then, once you're a confident person, confident in yourself, you attract other people. Self-support is critical. Every person needs the dignity that comes from knowing that you can take care of yourself and your needs no matter what happens.
I think that's where you need to start.