Is it wrong to have an interests?

Is it wrong if I have an extra interests? 

Why they disagree with me when I say I want to learn to play violin and want to buy one violin? I just told them I will learn from friend then they straightly say I will not learn anythings from a friend. Do they means I am stupid or my friend don't know how to teach? 

When I don't have this interest and just know play computer games or surfing the net that time, they keep on urging me to have other type of interest instead of sitting in front of computer. Now I want to have playing violin as my interest then they keep on disagree with me. What should I do?

Until now, I don't know whether I should continue with my interests or just give it up. In my heart, I really want to learn to play violin since I feel that violin match my style. Can anyone suggest what should I do?

Besides that, these few weeks until the end of this semester I am quite busy since got a lot of test to study. However, I will try my best. 

Why couple can be so sweet but

Sometimes I feel why couple can be so sweet but will break suddenly while some couple always quarrel but still can together.

Is it true that the more you quarrel, the deeper you can understand each other while sweet couple usually there is one party who only act like sweet only. So it break at last? Is love really that fragile?

There was an video say that we will meet 3 kinds of people. One is the person you love but him/her don't love you. The second type of person is you don't love but he/she love you. The third kind of people is neither you or him/her can say loving each other or not but just feel both of you appear in the right time. The 3rd kind is where mostly will lead to wedding. It is very meaningful.

Anyway, I wish all couple, please appreciate the other part.