No. 25 years in here. You may think you're a dumbass even then. Other people may think you're a dumbass. You will still make stupid mistakes. You will probably make fewer than other people, and there will be many mistakes you don't make any longer, because you've already made them and have learned your lessons.
But the feeling of being a dumbass may never leave you entirely. You will need to learn to control that some, and not always let on to everyone around you how dumb you feel at all times. But... honestly, the folks I've worked with who never ever admit to feeling dumb or doing dumb things - they STILL make the same mistakes, often more, and seem to have no capacity for self-reflection or skills improvement. So... understand your "I'm a dumbass" feeling may just be part of you pointing out that you can get better, and help you find opportunities to improve.