Hello there, welcome to Psych Central.

First of all I would like to say to go easy on yourself, they were not a waste of time at the time, these things kept you occupied. Everyone has obsessions to some extent, it only becomes a problem when you feel compelled to do it and it starts ruling your life. OCD is about trying to make things feel safe. So it appears, you needed these hobbies at the time. Ask yourself, what is it that you need in your life to replace this and how can you go about it? An idea, might be good to look into volunteering for example. If you feel these obsessions are ruling your life, then please go and see your doctor, it may be there is an underlying anxiety and this is your way of coping. Medication and/or psychotherapy may help.