Have you thought about selling or giving up a few birds? You have A LOT of pets. Clearly it's a lot of work as well because you're saying you can't get out because of them.
I agree with Indi, this isn't a suggestion but something you need to do. You need to get out, you can't stay locked up inside all the time. If you're shy, get out and just try. It takes time and work to not be shy. As for the bike, buy anything that has pedals, is in one piece, and works. Just get out, you can't stay inside all day like this, it's terrible for your health, both physically and mentally.