Don’t compare yourself to anyone else. It will only make you feel bad. Actually everyone is on their own path at their own pace. Compare to your own self where you were in the past and keep working to improve yourself. This way when you see improvement you will be motivated to keep bettering yourself and will do your confidence a world of good. Regarding strong mindset, my suggestion is to give up only after you know you have given your best. Otherwise keep pushing yourself to the best of your abilities.