I am 24 and a 34b how can i get bigger boobs?

No magic solution!: There is no magic solution to change your breast size other than surgery. Breasts come in all sizes and shapes. There is nothing wrong with having smaller breasts, just as there is nothing wrong with having larger ones- it's just what you have. Learning to accept who you are, what you can change and what you can't change, is an important life skill.