Does the love bomb stop the moment you get baptized? - yes. At least they stopped love-bombing me after I got baptised.
Do they force you to speak publiccly, even if you have difficulties doing it ? - not literally 'force' but they expect you to and 'encourage' (cajole) you to speak publicly.
Do they force you to give public speeches about a theme, or force you to go give a prayer to everybody as soon as you are a newly convert, and extremely introvert with stage fright and anxiety? - similar to the above answer, they cajole you to give a group prayer as a newly-baptised member.
is your average JW also a double standart type of person? I mean: Do they actually follow what they preach? Do they really believe in their hearts what they teach and learn? - I don't know the percentage of JWs who ignore the rules and the percentage of those who obey. What I will say is this: the JW leaders do a good job of scaring ordinary JWs. Most JWs who secretly have sex outside of marriage would be terrified that they will die at Armageddon.
Re the lack of love-bombing you experienced in the Kingdom Hall, this was because you were a curious outsider. If you were a person who was studying the Bible with JWs (a 'bible study') you would have been love-bombed. The JWs are stingy with their love-bombing, lol.
BTW your English is good.