You were lucky. It’s important for you to realize that.
Lots of people pursue education and do important jobs but aren’t paid well. One of the things you happen to be able to do pays well. Had you been born with other talents — some just as important to society but not paid well — you’d be struggling to afford to retire.
Nothing I’m saying takes anything away from your accomplishments and it’s not your fault engineers make more money than many others. I’m just saying: While giving yourself credit for having done well is great, keep in mind you were also lucky.