It isn’t that your idea is bad. It isn’t that you’re mean. Or too agreeable. It’s not your clothes. I guess it could be your smell but here’s hoping you shower regularly.
They just don’t know you. They don’t know where you’re coming from. They haven’t experienced working with you. They don’t get your expertise and they don’t know why they need it. They definitely don’t know your sense of humor.
The good news is you haven’t let anybody down. The challenge is that you don’t have many opportunities to make an impression, so when you do get an opportunity, don’t squander it.
When you have the attention, make it worth their while.
Making it worth their while doesn’t mean they need to know you better. It doesn’t mean you talk about how great you are or how good your plan is. It means showing you understand them, so that what you do sticks to their thing in a way that makes it better.
No one wants to help someone they don’t know. But most people do appreciate someone who understands them, listens to them, and wants their thing to be great just like they do.
So figure out how your thing helps their thing. Show you seek to listen and understand. Offer to help.
Then they’ll get to know you.