I use my left hand for everything except writing. Is this considered left-handed? What are the advantages and disadvantages of being left-handed?

I am left-handed, but there are always those who think that if I don’t use my left hand to write, I am not left-handed. Writing is a life skill like other things. As long as you are born with your left hand when writing, holding chopsticks, or playing ball, you are left-handed. Because this world is dominated by the right hand, it is difficult for someone who is purely left-handed not to be affected. It’s all bullshit to say that left-handers are smart and have short lifespans. First of all, there are also idiots among left-handers. Although left-handers do generally have high IQs, not all left-handers are smart. Short lifespan is even more nonsense. Then SB’s university survey only surveyed a few hundred people. Can it represent the 6E left-handers in the world? The advantage is that opponents are not used to it when playing. The disadvantage is that many tools may be inconvenient to use, such as fruit knives, and it is easy to "fight" with others when eating or writing. . .