Anxiety and low self confidence

Hi all.. I had been achiever since i was a child and quite confident. Unfortunately I started following the crowd instead of going for what I like. This went for over 10 years post graduation. Now that I came into my senses I am in the process of making transition in my career. I took a break and went back to studying what I actually liked. However, time and again my belief in myself goes down. All these thoughts of regret for wasting my time for 10 years and now starting over from ground in another field and looking at peers of my own age around is lowering my confidence. These thoughts keep me distracting, has increased my anxiety and keeps me from concentrating on my studies. I worry with all these I may again not get a job which I would like to have after this big step of leaving previous job. This creats even more anxiety. And the cycle continues.

Please suggest what should I do to keep focused on my goals.

Thanks in advance!