Is going "shopping" with two girls gay ?

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Adding a little context to the situation that is not complicated at all

>be me in september 2016
>18 highschooler
>little to no friends, my group consists of other social outcasts like myself. /r9k/ tier
>decide to fucking put an end to my robotfaggotry and actually make some effort to socialize. I got a late start but i try
>manage somehow to sucessfully initiate friendships with three girls (female)
>interested in one but she's already taken. The two others are also qties
>highschool year is passing without trouble. I try to spend my time evenly with the two groups( my peers and the girls) but it's difficult as sometimes it was better to play melee with friends instead of going outdoors socializing either by studying together or enjoying shitty processed food and sweets, chilling ect. Sometimes it was the reverse.
>eventually I start to leave behind the robots and spend more and more time with the girls
>by the time highschool was finished, they became my best friends. Still interested in one of them but being an inexperienced virgin does'nt help me into gathering courage to take further steps
>not later than yesterday they invite me to some late night party. I made good use of the occasion and invited them to join me shopping in the afternoon beforehand as I'm planning to buy new clothes

Did I become gay ? Am I infected by the roasties ? Is that natural that I became more attracted to outdoors activities, to the point that vidya and anime became boring as hell ? What's happening ? Is there an explanation ?

Help me /r9k/. And sorry for my broken english.