Get an inexpensive pull up bar that hangs on a door frame...for that matter you don't even need one: a low hanging tree limb or set of playground monkey bars work but might be harder to grab. Start by using some sort of a chair or box assist to help you do the pulling up then do a negative - which is letting yourself down slowly with little to no assist. Eventually you will be able to do a pull up with no assist. Do as many as you can with no assist then use your legs to complete your goal (12 - 20).
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Don't be so concerned about yesterday, or worried about tomorrow, that you forget to enjoy today.