regrets and remorse

When regrets and remorse are the chains that bind you in a mental state of existence, how do you break free?
I keep seeing this commercial for one of the smoking cessation products and the man says something to the effect that since his child was born he has been able to quit smoking with this product. So when I see this commercial I feel a deep guilt that it took me more than a decade after my daughter was born before I quit. Additionally I continue to struggle with my addiction and cravings, when I smell cigarette or cigar smoke, I want one even after 10 years that has not gotten any easier. I have a lot of remorse that I started smoking and regrets that it took me so long to quit.
I scream inside because of how weak I perceive myself to be. Not mentally or physically strong enough to accomplish my goals. Regretting not being able to push myself through pain and injury to stay in the Army because all I did was change my location still had to push through to get through life.
So I chained myself mentally and emotionally in this spot where I feel all of this guilt and even shame that I have held onto for decades now. When I think about it I know that for some reason I do not want to let these things go, I want to hold onto all of my baggage and I can not explain why that is. Really does not make any sense.