my dad is very embarrasing to me

Hi Sockr4, I think there may not be a quick fix solution for your problem. Concerning your father's obesity, there are usually contributing factors involved like stress, emotional issues, genetics etc which your father may need to overcome first, that is, if you wanted to assist, help or encourage him to better his current condition (maybe with your mom's help).

I do understand how this is a problem for you too, finding him embarrassing must be difficult. I doubt that you feeling embarrassed of your dad will change unless you can either focus on what makes you proud of him more and be happy with him as is or, tackle the problem and begin operation: Get Dad healthy.

It could be a great bonding experience for you guys to exercise, eat healthy or play sport together. Maybe that would also help him to release some of his anger ("huge temper"). No doubt there is probably more to why your dad is in his current physical state, but this could be a positive start to a happier and healthier father son relationship. All the best.