Student or Learner
How can i use my vocabulary collection when i speak or write? I just forget them when i start talking or writing.
Rather than have a whole list of new words, try to learn and use one or two each day. Practise phrases or sentences before you go out for the day and focus on using these.
Alternatively, you can keep a short list (like a notebook or diary or even your mobile phone!) on hand for writing.
A useful website for thesaurus/synonym development is Dictionary.com