Meaning of ALONE in English
BAD : I was very alone at first but then I made some friends.
GOOD : I was very lonely at first but then I made some friends.
alone = without other people around you: 'I've thought about getting married, but I prefer living alone.'
lonely = sad because you are alone and feel that nobody loves you or cares about you: 'I didn't know anyone in Boston and felt very lonely.' 'Sarah hated the long lonely days in the empty house.'
BAD : Children learn a lot by doing things alone.
GOOD : Children learn a lot by doing things on their own.
on your own = without anyone's help or supervision; independently: 'He built the car all on his own.'
Longman Common Errors English vocabulary. Английский словарь распространенных ошибок Longman. 2012