Hey Otterboy,
I'm nearly 28, started taking finasteride 1.25mg daily when I was 26. I was getting crazy side effects too (couldn't get it up, had sore nuts and a general miserable feeling) and found what was probably the same board you're talking about. I think visiting the propecia side effects board gave me more psychological side effects than the drug was giving me.
I posted on a few boards and asked some questions, found out that it's quite common to have some side effects at the beginning and I just stopped worrying about it. I did find out that taking the drug every other day is just as effective so you should probably do that.
Anyway, long story short, my side effects went away very quickly (3 -4 weeks) and 1.5 years later they haven't returned. My advice personally would be to talk to a doctor but I wouldn't give up on propecia too soon. Try not to worry about it, I think a lot of the people who talk about long term side effects from propecia are either scare mongering or have it in their heads that propecia destroyed their lives.
Hope this helps