What mindset to have while finding clients?

I am an experienced SEO professional but till date I am very hesitant and anxious when it comes to finding clients.

I think my mindset is the reason because most of the time I think that I am overcharging or no one will hire, there is so much competition , etc

Please, tell me:

1) What mindset to have while finding clients?

2) What can I do to tackles this problem?

Your help is priceless as well your opinion. Thanks for anybody who is willing to help me and other people having same problem