It sounds like you are. I have a friend in similar financial difficulty due to her divorce, no alimony due to jobless ex-husband and medical issues. Her credit was shot and pretty much non-existent. She got a secured CC thru the same bank she has her checking account with using collateral money in a savings account (still her money earning interest, just she can't access it whle she has the active credit card) with same bank that she started up with some money from her tax refund. Having a CC (secured or not) and paying it on time all the time is the fastest way to build up good credit. Eventually you may get to the point where you won't need a prepay account anymore. Companies like Dish and your utilities for example don't report good credit events, only bad ones like missing/late payments.
I thought about that angle of using a secured card to build good credit. Problem was (and is) that my income is so low that even if I did get a secured card and used it for a while to build credit, they still might not consider me as having good enough credit to get the best offers for things or real credit cards, simply because my income is so low. If they could absolutely guarantee that it would work for that purpose, I might do it. But as things stand it's sort of a "Pay us now for nothing. Eventually you might get it back years later. It could help build you good credit- or not- no guarantees.". The fine print on the offers was all pretty clear that they weren't guaranteeing you a regular credit card or anything down the line.
Honestly, it also just bothers me that it's sort of a bum deal. I don't want to loan my money to a big corporation to try to work their own credit system that I don't really like to begin with. They sort of in a way create the problem with the way credit scores work, and then offer you a potential solution that involves loaning them money, and then in the end you aren't even guaranteed it'll fix the problem you're trying to solve. I think if I had a better income, I might give it a try, but as things stand, it just seems like I'd be putting myself in a position to get screwed again.