I'll assume that your manager complained about your work, saying that you are overcommitting and underperforming, that you miss deadlines, that you arrive late and spend your time talking to colleagues, and that you overstay in your office. If that's a case, that's something you need to change not just to "gain confidence and build trust", but to keep your job.
The way to do this: If your manager is reasonable, then don't arrive late ever, unless you have a very good reason for it, and in that case, tell your manager the reason. If your manager is unreasonable, then don't arrive late ever. Don't involve your colleagues in conversations in a way that keeps you from doing your work, or worse, that keeps them from doing your work.
The complaint about "overstaying in the office" is interesting. If the company doesn't want anyone overstaying in the office, then don't do it. The complaint may actually be that you are not doing your job, and then you try to pretend being a hard worker by overstaying and not doing any actual work. Some people would really hate that. Check out whether you are not supposed to overstay without working, our whether you are not to overstay at all. And then you either leave in time every day, or you stay and work.
The last and worst are "overcommitting and underperforming", and "missing deadlines". Your manager may have two impressions: One, that you don't do the amount of work every week that you are supposed to do. That's something you need to change. Two, that you make promises that you don't keep. To that, the solution is to not make promises. If your manager says "can you do this in two weeks", then there are two possibilities: Either you are 100% sure you can do it, you say yes, and you do it. Or you are not sure you can do it, then you tell your manager. It's much better (for your manager, and for you), to say you can't do it, than to make promises that you cannot keep. And that's his complaint, that you don't keep your promises.