Just be open and honest. Therapists don't want to hospitalize you unless it really is in your best interest. Most people who self-injure are high functioning and intelligent and resourceful. We do this more as a way to survive and keep going than anything else. It usually doesn't indicate being suicidal. Be ready to tell T what you have to live for, and show that you want to work towards improving your life. They are generally only going to hospitalize you if it is necessary to keep you safe and alive, or if you and T decide together that you would get something out of it, and you voluntarily choose it as a treatment option. Your therapist will have your best interests in mind, and being open and honest helps them best to know what is in your best interests, as well as gives you more trust and more options and more say in your own treatment.