I'll start off with some context: I'm 19, and I've had problems keeping friendships for as long as I can remember. I have no problems making new friends (but it's a bit hard for me to relate to people). But right now I'm in a social situation where a lot of the interaction takes place on text or social media. My friends text each other for hours whereas I can't continue conversations on text for more than 10 minutes. I can't even keep in touch with really good friends who I don't see everyday. I don't want to lose their friendship due to lack of contact.
I'm in college right now and I can't make new friends with people who I'm not in the same class with because those kinds of relationships mainly develop over texting. So how can I get better at texting?
Edit 1: A bit more explanation: I keep seeing my friends text each other all the time but I've never understood what they talk about for so long. I know for sure that it's small talk. But how they manage that for hours is difficult for me to understand. Something specific I'd like to know is this: How do I turn small talk into a meaningful conversation without being too forceful?