Well, conversation is not only about what you want to talk about, especially as you are trying to start one.
Body language is also very important, as the first impression is. Although it is not what will leads your relations with other people to great friendship, this is where all friendship starts.
Now I have almost no trouble getting in the mood of a conversation or integrating myself somewhere, mainly because I'm curious, but I also learnt to show directly to people even if they didn't know me. Back when I was in prep school, at the very beginning of the year, I tried something: I talked a lot with almost every single member of my class (we were more than 40), at least learning their first names, talknig about studies, weather and seemingly useless things. One month later, I was nominated referee of my class with another guy, while I had been trying to do so during 10 years, and always failed.
Deep personality, very good points of view, reflexion and experience makes you great friends, but in order to be able to talk with everybody, you need to talk about useless stuff sometimes, as stuff is useless because everybody is talknig about it, making it wrongly uninteresting and pointless.
It doesn't mean I have a lot of good friends. I'm kinda like Shroob' in that aspect.
Adsolution wrote:About brother and mother
Don't understand the attitude of your brother: your studies are none of his business at all, he's not getting involved into that. I understand even less the attitude of your mother not represing him for what he told you.
I usually don't try to influence my brothers about their studies: not my business. But I'm asking often how it is going, and what their plans are, because I just want to know how they are, and if I can help them in any possible way. I'm the big bro', after all

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Something which is bothering me right now: as I will graduate soon (in 3 months or so), my parents are stressing me to search for a job by doing tons of letters and sending my CV everywhere. The problem is I'm still a bit childish about that: I don't like people telling me to do what I already know I have to do, and the more they talk about it to me, the less I want to do it. My parents are also very stressed about my brothers passing their BAC exams (equivalent for baccalaureat/A-Levels/whatever you have in your country in France), and they are also annoying my girlfriend with our family problems (I actually met my GF because she was renting my bedroom while I was far away from home studying somewhere, and she will leave soon).
I don't like people I love getting involved into family matters that don't concern them at all. I apologized to my GF yesterday about that because even if she told me I was the only person she would allow to do so, I did it anyway and was very pissed off about myself doing that.
She also told me my father was waiting for me to talk very seriously to him to get convinced I finally became an adult, and I answered I didn't see the interest of this kind of conflict: sure, if it happens, he's gonna take a very heavy morale beating, as I usually don't like to rant randomly on people I love and forgive very easily, but I have a very good memory.
Ah, family...