Until recently, I practiced penetrative sex with my (female) partners.
I've come to conclude that it was really, really not right for me, and that even though the anatomy works (some of the time), it was a terrible feeling. A requirement, a job, a task, so much stress from trying to actually keep it up (cockrings helped some), and afterward I felt not so great. It took me a long time to realize this.
I find going down on my girlfriend brings me more happiness than I can remember from sex.
This is odd, but I've found that I can't look at my genitals directly, like while receiving oral, but if I watch it in a mirror, it's actually kind of hot. Not looking at it directly lets me disassociate it, and I actually love watching oral porn. Can't stand looking at myself, though.
Like others have said, you just have to feel out your comfort zone, and most importantly, communicate if how you feel changes. Dunno how far you are on hormones, but I imagine your interests will change over time if you started recently.