There's no defined thing in life that what you pick is the one you should continue with.
If you are unsure, it gives you the power to pick anything that you are interested at that point. Be in that field for atleast 1.5yrs. Learn it's ups and downs, see that if even in downs you are having fun, if you are, continue in it.
If not, find out why you aren't happy and if it's related to doing something else, then do it dude.
Find and do what makes you happy! It's your life, you decide what you wanna do! It's fine if others are ahead in life, it's their life, they have figured it out, why compare it with them?
You can definitely do all this till you are 30 / till you don't have any other responsibility like marriage or kid. If that's not the case, it's mostly better to earn a steady income to support your family than look for what makes you happy as in this case there are others dependent on you