As Lucretia says, 22 is still young
I'm now 39 with 2 kids of my own and I still struggle.....my first recollection of the feelings that go with any of it for me I would have been about 6!!
I would be described as having what is known as a 'disorganised' attachment style. My current therapist and I are now working on this directly. So, whereas before it would always be an issue for me that I never talked about just panicked about, we have worked at creating a secure and well boundaried attachment. The idea being that she will model a healthy attachment so that eventually I will be able to 'detach' as it were.
In the beginning it was hideous.......she didn't exist if I couldn't see her and in my mind I certainly didn't exist for her if I couldn't see her .....the sick, panic feeling was overwhelming and I used to have to check on her 3 or more times a day. Now after 2 years, the week to week gap is generally OK and I am confident about how she really views me, what she might say to me if she was here with me, I remember what she is like to look at, what she sounds like, what she smells like and that makes me feel safer in my day to day. I am confident she will be there and be the same every week. She has worked so hard to give me consistency and stability where I have never had it before.
I dread, leaving........but not as I used to. I don't feel totally lost and sick just at the thought of leaving her and finishing therapy. I know the time will come and can accept even that I will want it to happen eventually, I can feel that this is achievable most of the time.
One of the best things is that because she is a safe place, I don't have all the unsettled attachment stuff with several other people that I used to. It's all around her, which sounds very dependent but in fact works in quite the opposite way. By not being afraid or rigid in her approach to my likely dependency I have stopped trying to cling quite so much to her by myself which also feels very empowering.
And just back to you being 22 - well even at my age I still feel about 2 a lot of the time!!