Today I was at a coffee shop waiting for a few buddies, reading a book (The Power of Now) when a cute girl walked in, and went and sat. I finished my coffee, walked past her to the restroom (rinse my mouth, and let her see me once and say hi) then sat down, talked about her studies, where she lives, a bit of music taste etc.

Any way, her boyfriend/SO shows up, sits down, she introduces him to me, I say hi, and conveniently, my buddies arrive right after, so I excuse myself and wish them a good day.

The thing is, even though I rarely every approach, I don't even feel the urge or desire to. I simply did this today because I was watching a bit of RSD stuff, and felt like breaking my comfort zone.

Is this normal for a 20 year old to feel no desire to approach a girl at all?

Edit: I have had one girlfriend, lasted 6 months (December to May this year) and that's it as far as women go for me. I just don't feel like dating currently. I don't think it's Low-T