Talking to a girl on random settings

So here we go, i never have i ever thought i would do this but
I am 24, take a bus and months ago i saw this beautiful girl who i guess is of same age initially i did not approach her but slowly she felt my presence and i got the hints to talk but my shy ass wasn’t ready or felt shit load of nervousness and i was not able to make it but as time passed by and she was still giving hints that she is open for the conversation i went one day and without hesitation i walked to her and had a nice chat then a month or two passed by i did not talked as our first conversation was brief yet charged up she showed positive signals to move that further ahead but again i was shy and confused my self defence is really shitty and i kinda fall apart but the eye contacts or non verbal signals did not stopped and then after a lengthy period of time i went to her again and then talked to her it was good we talked on the stop and then she sat with me in the bus and talked till her stop came and she seemed interested and then there was a brief gap and i sensed that she felt bit frustrated and choose a cold side cuz she was giving positive signals but i was hesitant cuz i am not the dating expert and thats my first time approaching someone ever and that too on bus stop and then i was too quick to recalibrate and went to talk to her again very short conversation happened like greeting and weather talks and bus timings and all and one day i went to her and asked that we dont have enough time to talk would you like to go out she said she is busy but we can talk about it later as i was soo much into her my mind completely ignored a fucking fact that i have to ask for her number and its been 8-9 months and now i am ready and i guess confident enough to talk but she seems shy or nervous but i feel like she is as interested as i am too we talked very less but the non verbal talk never stopped and i am very shy more than usual but she is too shy too normally girls of my age are open but she is shy and i find her cute ofcourse but hints of
Nervousness and interest and i would like to post it here so the angels sent by god can reply me and help me navigating the situation well.