How you started on it?
This I answered in the post above yours, please check.
What motivates you to keep doing it knowing that you already won a lot.
First of all I love betting. So whatever I will be doing in my future, I think it will always remain at least a hobby. It's just super fun for me. I turned my hobby into a profession, what more can you ask for job wise.
I won a lot - well there are people that have won way more than me - but I also spent a lot for paying my bills etc. So what keeps me going is the fact that I am far, very far, away from being financial indepently and the bills keep coming in unfortunately

I see this as a normal job, it's just maybe a pretty rare one, but not that much different from any other job the people do. It gives you some freedom, you have no boss, no one to report to, but you still have to put in a good amount of work and dedication to keep it like that. The biggest difference for me to a "normal" job is, that it is called work, but doesn't feel like that, because it's also my hobby.
A lot of people, lets say in western countries, have earned tons of money. The problem is, you always have to spend most of it just to live your life

So nearly all people have to keep on working, although they already earned so much.
I'm asking since Im not a good gambler,I'm finding it hard to risk money in gambling knowing I'm not skilled or lucky enough in winning in it.
No problem being a bad gambler, most of the people are. There are games (dice, roulette etc.) you just can't beat, no matter how hard you try. There are certain games though (betting & Poker), where you can win, if you develop skills. And you don't even need luck with these.
I remembered there was a thread here which asked whether there are gamblers who are professionals in the field that they make a living from gambling alone. I remembered arguing that there are indeed professional gamblers but I doubt if they are fully dependent on gambling for their and their families' day to day expenses as they are not immune to losses and the tide is definitely not always on their side. They must also have losing days.
Since you are a professional gambler yourself, I want to ask you this question. Is gambling the only source of income for you? I mean, are you fully dependent on what you win from playing games? And what if you have a losing streak, which I think is normal, how could you manage to still support yourself or your family and still able to go back to placing bets again?
I used to have a little job, which gave me a small steady income and also paid for my health insurance and things like that. I liked that job, since it put me away from my screens for some hours every week and sort of refreshed my mind. I never liked to spend the whole day in front of the computer, I always looked for some variety, which that job gave me, but also doing some sports, going out, doing this and that. I don't have that job anymore, so I am relying solely on my bets now, which is putting some pressure on I must confess.
Losing streaks happen of course. To go through this drought you should have a money reserve on top of your betting bank. There is different opinions on how much money that should be; I think it should be as much money as you need for the next 6 months without earning a penny with betting.
What's your attitude towards slots?
Slots are not a way to make money. You can of course play slots to entertain yourself a bit, but don't expect to win anything; every hobby costs some money. Slots are pretty addictive, so if you have other options to entertain yourself, I would probably choose those.