Are you all going to the same college?
And how large is the college?
The place I'm in is 1000 people each year (2000 in total) I'm just finishing the second year, and I'm not remotely friends/don't talk to any of the friends I had at secondary school. Tbh the friendship group has just properly formed recently
There's not exactly a 'way' to do it.. and you definitely can't force your way into a tight knit friendship group, because it'll annoy/unsettle some people.
The way I did it, was (all the people I was friends with in secondary school were not nice, boring and I just didn't click with any of them) (all girls) right at the end of the year I made friends/rekindled an old friendship with this girl I was friends with at the start of secondary school and these other girls in my english classes (who were friends with the girl I was friends with a while back), in turn I became closer friends with a few girls that I got along with much better.. so I started talking to them more in lessons and hanging out with them at lunch but this was in the last few weeks of secondary school.
College ended and I stayed in contact with 2 of them (went to parties met up with them over summer) and from this - you make friends with SO many more people.. you meet people at parties, get along with them, they invite you to more parties and you start meeting a whole new group of people.. and you'll start to see the same people at regular parties. And this forms a small group. Some of these people might go to the college you're going to in the area.
So in my opinion keep in contact with the two that you like - stay close with them, because eventually they'll meet new people and you can meet these people too, go to parties with them etc. Once you start college, you can start hanging around with those people at parties, and eventually meet their friends, and those friends etc, and a proper friendship group will form.. whether this includes our older friends or not I don't know, but you don't have to continue being close with them even if it does, because there will be other personalities and people you can get to know and get along with