Hello there, welcome to the forum.
It's totally understandable that you're scared, crohns can be a devastating illness to be diagnosed with. Honestly I don't think anyone would not get at least a little scared when first diagnosed. The positive thing is that now you have a diagnosis, you can have treatment and start getting back on your feet.
I can't tell you it will be easy, I can't tell you it will all disappear or how long it will take you to start feeling more like yourself again. What I can tell you is you are not on your own, this will get easier and your life isn't over.
Crohns is a tricky illness, there isn't a one size fits all treatment, but there are a range of treatments that can help you. I know it's hard to go from being healthy to being reliant on medication, I'm only 21 myself, I was diagnosed at 19. So I totally understand the fear of what life could hold. However, like I said there are good treatments now, it is possible to have a full, happy, productive life. Treatment can't cure crohns or garuntee you won't have a flare up (where the disease is active) but it can get you into remission, which is where you have no active inflammation and no symptoms. I can't tell you how long it will take to get there, but it is achievable. Although it's different for everyone, deep, stable remission supported by the correct medication(s) and regular follow up with your medical team can last for many years, we have members who have had remission for more than ten years, and I've actually met one person who got remission for 30 years without any symptoms. I'm not saying that will definitely happen for you, and I'm not saying it will definitely be straight forward, but there is hope, it's definitely possible, you won't feel like this forever.
Do you mind if I ask you what treatments you are currently on?
Take a deep breath, have some time to take in everything that's happening, remember that you are still the same person you were before you went into that hospital, crohns does not need to define you. You have crohns, it doesn't have you. We are all here for you, so please don't feel alone. If anything specific worries you or there's anything you'd like to know, please don't hesitate to ask us and we will do our best to point you in the right direction. It's ok to be scared. We're here.