...راستش = to tell the truth... (literally: the truth of it [is...]) ...دلم می‌خواهد = I wish... (literally: my heart wants (to)...)

راستش: راست + ش = right + his/her/it (it means honestly, to tell the truth) من: I دلم: my heart می خواهد: wants من دلم می خواهد : I want to, I like to (do something) راستش من دلم می خواهد: To tell the truth, I like (want) to ... We add دلم to emphasize our deep appetite and wish to do or have something: الان دلم یک چای گرم می خواهد: I like to drink a cup of hot tea right now.

راستش من دلم میخواهد: (actually i want to) Or: ( actually i wish ) راستش: ( actually) من دلم میخواهد: ( I want to) or ( I wish)