School life comes back quickly.

Now i am at a young age i have began working as an intern in a phamacy

Now, even though I am still young I have begun working as an intern in a pharmacy.

i am busy with my work every day

I am busy with my work every day. [Correct, just no punctuation. Remember to capitalize first letters of sentences, and the pronoun <em>I</em>.]

it takes the most of my time to work

Most of my time is spent at work.

i miss my school life because i have many spare time to do myself things such as yoga shopping travelling and so on

I miss my school life, because then I had more spare time to do things for myself, such as yoga, shopping, travelling, and so on.

I hope you at least have time to add periods, commas, and capital letters.