Is it easy to make friends at community college ?

It should be, since most come from areas near by.

For a very shy person, making friends is hard in any situation.  However, once a young person leaves home they are then spending much time with different people, many of whom they never knew at all before. That is an advantage because those new people in your life don't know anything about you and whole new relationships can be formed from meeting these new people.  If you were still surrounded with the people you'd known before they'd probably treat you as they did before and you'd feel inhibited but, once amongst new faces, you can be a new you.  They have no knowledge of you, nothing to judge you by and if you can relax and try to be natural you'll meet new people and find some who share your idea, hobbies, choices etc.  Try to disguise your shyness and it will become less of a problem as time goes on.

I know all this because I was once painfully shy.  Moving away from home helped me make those changes.

Making friends in community college is easy, of course, but maintaining friendships is difficult because you have to sacrifice a lot.

I thought it was easier than at university. 

It's easy to meet people. Making friends isn't so easy as at university. At a community college many students are older, have jobs and families, live further from campus, and little time for socializing with classmates. But where there is a lot of opportunity to meet new people there is a lot of opportunity to reach out and offer friendship.