It is better to go straight for B license.

Take it from me. I have both B2 and D license. I got both cars and motorcycle. B2 although is easier, you will need to retake when you want to upgrade to better bike. A lot bike that are comfortable, stable (safer) and nice to ride are in higher cc. Furthermore some center charge B2 and B same price. So why do it twice (and pay twice) when things can be done once.

170 cm is no problem. Your height is average height. How to stop-rest is skill. There are plenty of video on youtube on how girls (that are short) riding bike and stop safely. Don't let that be psychological hindrance.

What does big cc have to do with L? I thought B2 vs B full?

L will turn into P and finally turn into a normal driver's license.

if you not confident with B full, take B2 first, its easier,
and B1 ?? anyone here know a place where we can get a B1 license ?
i search a bit and no one offering B1 class