I feel really guilty for this?

Today I was hanging out with my friends (I'm 13, my friends are 12, 12, and 10), and we were really bored. My brother and my friends brother were hanging too, also with my brothers best friend. My brothers best friend is a really nice guy, only 7. So we were bored. My friend started annoying them, and it kept escalating. I told my friends that we'd get in trouble for this, but they didn't stop. They started bugging my brothers friend about how he wears his jeans a little baggy and that his fly was down, and he didn't know how to defend himself, and i felt really sorry for him. It got to the point where we cornered them, then we left them alone (at least i did, and my 10 year old friend), I have no idea what my other friends did. Well later I talked to my brother, and he said they chased him all the way back to my house and they hid in my house really scared. To make matters worse, my brothers friends sister is the only girl I babysit, so if he says something to his Mom about me, I might lose the job. I feel so guilty. What should I do?