No point being 'with' your girlfriend if it leaves you with no prospects for the future. You must have both discussed your plans and that they involved uni, so you work around them; know each other's schedule, arrange times to get in touch, but make allowances for things getting busy and doing things spontaneously that means a cancellation. Make the most of the opportunities available to you; try new hobbies and sports, volunteer, do a charity event; after all, isn't that why you are there, for an education, some independence and being productive? Otherwise you could have sat at home and done an Open University course.
Clingy and co-dependent is not a good look.