This may seem harsh, but in answer to your question "how does one get people interested in them," I think the honest answer is that one doesn't... one gets interested in something outside themselves, and then pursues it, and other people who are interested in the same things, or view the world the same way, click with one and become one's friends. Here's how C.S. Lewis puts it:

Friendship arises out of mere companionship when two or more of the companions discover that they have in common some insight or interest or even taste which the others do not share and which, till that moment, each believed to be his own unique treasure (or burden). The typical expression of opening Friendship would be something like, "What? You too? I thought I was the only one." . . . .The very condition of having Friends is that we should want something else besides Friends. Where the truthful answer to the question "Do you see the same truth?" would be “I see nothing and I don’t care about the truth; I only want a Friend,” no Friendship can arise—though Affection of course may. There would be nothing for the Friendship to be about; and Friendship must be about something, even if it were only an enthusiasm for dominoes or white mice.

Maybe the above is a little too exacting, and one can find friends just by looking for them, or be friends with someone they have very little in common with. But my best friends do tend to follow the CS Lewis mold.

The takeaway, I think, is that if you want friends you have to a) do stuff you enjoy, b) talk about stuff with others who also enjoy it (I hate this part), and c) wait for friendship to happen as the talking and doing reach a deeper level. Alternatively, if you're around the same people often, have conversations with a view to seeing if they think like you, like the same things you do, etc. If they do, great. If they don't, don't force it.