Hey Xavi :)
This is also my first post, and I feel like we have a lot in common. Like you, I have felt self-doubt, uncertainty, and feelings of anxiety my entire life. I was never able to recognise or label the anxiety until a few years ago.
It is fantastic that you have recognised and been able to identify your feelings AND communicate them- I think that this is the most significant and most important step! It certainly was for me.
Don't feel as though you should restrict your posting or seeking help on the basis that your symptoms may be milder than others. I remember feeling this way also. Even though some are dealing with more significant issues than ourselves, we should not disregard the importance of our health.