1. Anyone who doesn't know how to do something can learn how. Just because you don't know how YET does not make you stupid or useless - you just need information and practice, like anyone else.
2. Being good at sex means you can look forward to rewarding intimacy with the right person at the right time.
3. You are not a waste of other people's time and effort. I hate to waste time or effort, and I'm here responding to your post.

Even if you just need to vent, please keep posting. People may take a few hours or a day or two to respond.