The first choice.
Beastfeeding should ALWAYS be the first choice. I believe this with all my being. There are so many benefits to breastfeeding that it should be seen as a first choice. It should be taught as a first choice. Nutrition to bonding breast is best. 
Not the only choice.
I said it should be the FIRST choice not the ONLY choice. Yes breast feeding has more benefits than formula, it does, there are no arguments against it. However, this isn’t a life or death situation. If your child is fed and cared for (no matter how) then you are an amazing parent.
As a first choice you should try.
I believe no matter the person or situation breastfeeding should be attempted. If you go to work or school, you should try to get it done. If there are physical reasons against it you should try to find ways around it. If all else fails, consider donated breastmilk instead of formula.
It’s okay if it didn’t work out.
There are so many reasons breastfeeding doesn’t work. So many. Just because one person can work through the problem that stopped you doesn’t make you bad for stopping. No two situations are a like(no matter how similar they sound). Do NOT feel bad if breastfeeding doesn’t work for you. If you breastfed for one day or two weeks or three months or even two feedings, you did a great job. I, personally, am proud of you. Go you, super mom.
Don’t let others convince you to stop.
For some reason for the first 6-12-18 months(depending on the person, different claims from different people) breast feeding is an absolute must. If you dont do it you’re some how a bad parent. Then magically after this point your some how the bad parent for “allowing it to continue”. The WHO supports breast feeding until 2 and beyond. MANY doctors and proffessionals support breastfeeding toddlers. A lot even support breastfeeding preschoolers. There have yet to be any studies that say or prove negative results of breastfeeding toddlers and preschoolers, however there have been many positive benefits that are proven. Don’t let people tear you away from your goals.
Be proud if you breastfed to your goals.
Whether your goal was 6mo, a year, two years, three, or until your child chose to ween, you have every right to be proud (hell you can even brag a little if you want) of reaching those goals.
Its okay if you didn’t reach your goals.
As long as you tried, you have a right to be proud. Its okay if you didnt hit your goal. You can be proud of what you HAVE done.

Breastfeeding should be the first choice, but not the only choice. As long as you are doing whats best for your family you have every right to be proud. Go you. Good-life to you all.