I don't have much time to go into detail, so forgive me but I'm going to use bullets:

- Don't feel inferior and accept yourself for who you are. We have our strengths and weaknesses and your husband wouldn't be with you if you were "inferior"
- You need to learn and grow through experience. Be prepared to put aside your pride (which appears to be the case when charging the car) and take steps to grow. We all have to learn and sometimes it means we'll feel "stupid". However, you can always learn and grow
- Maybe speak with your partner. If your confidence is low, then snarky comments don't help, nor does him looking over you when you try to prepare meals. Have an honest conversation of what you're trying to do and explain that you need support while you learn

Finally, I think you're doing a great thing. We all want to improve for our loved ones and to see you making a concerted effort is admirable