hello aditya jagzap,

yes a boy cna become actor without doing any type of course, but i feel is you need to make contacts for this which you will get from some of the institutes only, becouse they do have contacts and tehy also provide oportunities for their student so that ther institute will become famous. so i must suggest you to go fo some institute you will lear many things as well. and do make contacts this will definitely help you out. 

so all the very best have a great future ahead.