If you have a recorder and a player which are different items try putting them at opposite ends of a room and sing along to something you think you can join in with whilst recording the result.

It can be very revealing about just where you pitch your voice, how you breathe, etc. compared with whoever you chose to sing with.

Try playing the 'professional' recording both fairly loud and quite quietly and see how you cope with being the secondary or the primary sound - that can be interesting too.

Finally - be sure to wipe any really dreadful attempts or they are sure to come back to haunt you in years to come.

Anne