I need help with my Imposter Syndrome

I’ve been at my job for around 5 years now and I’ve increasingly felt this crippling imposter syndrome which only keeps getting worse. Objectively, I have done a good job in college and I have not always been stupid. Infact, I’ve done better than most around me and single handedly handled all group projects, build code effectively and all of that. But I cornered myself in my job because I hated it to begin with (not what I wanted to do but it spills over what I’d like to do) and I feel like I’ve learnt nothing over the 5 years. I don’t like to brainstorm with the team because I’m scared people will think I’m stupid and talk about how I sustained 5 years here being so stupid, and judge me cruelly behind my back. I feel like everyone does a better job than me. I’ve always been terrified and timid and very low confident, and always felt guilty for not trying harder. I feel like I’ve lost my analytical and problem solving ability. And I’ve definitely lost the ability to sit and focus. It has become too tough. And I’m stuck in a loop of guilt and regret and I have no energy to better myself. What do I do?