This app was mentioned in 4 comments, with an average of 7.00 upvotes
As a first step, just to make sure, ensure you are logging in with your account ID - which is separate from your public handle and nickname which do not have to be the same thing. That shit's confusing and I've seen a testing-environment login page that asks for email address instead of messing with all of that ID/handle/nick stuff. The username is probably also case-sensitive.
If you're using Chrome, use Firefox or something else because Chrome's had problems with the captcha - try another browser, in other words.
It's also a good idea to set up and use 2FA (in the Security section of your account on the site, THAT works in Chrome) with their authenticator app (there'll also be one on Apple's Appstore if you use iOS).
Star Citizen Authenticator
Google Authenticator
Authy Authenticator