Well well, I must say this is a never ending concern. I have it as well. My cock is not as thick as yours but just as long, I guess. Whatever.
Yes, I worry every time I have to undress for the first time with somebody.
Yes, I know the expectations everybody has.
Yes, I know my own perception of my small cock and, after watching so many porn movies, I can see that my cock inside my bf's ass is small. Well, smaller than the average.
But at the same time, if what you're looking for is sex, you have to expect that most people want great tools. And from a quick, superficial point of view, a great tool is not
a person but it's
a part of a person (i.e. a cock or an ass). Would you like to have sex with somebody you don't like? Well, for them it's the same, but what they don't like is a smaller d.
That said, I'd love to have sex with somebody with a small cock like yours. It would be easier to manage for me

Only once in my life I met a guy with a smaller than average cock and I was very happy. Alaso because I really liked the guy.
And a friend of mine told me about a guy he met, so handsome, but so shy about his small cock that he would take Cialis before a date just in case, because anxiety would prevent any erection. How much time and energy wasted instead of enjoying what we have.
Can we change it? No, we can't.
Can we change what other people think? No, we can't.
But if you find somebody who likes you totally, then you can have fun and, if you want, use toys. I do and I love using my cock and a dildo at the same time when I top some1.
Take care!