Let me tell you, there is nothing that can beat a Solo trip. If you can survive a Solo trip you are the prophet of your decisions. Create one itinerary and pack your bags.
Hey Pallabi, solo travelling is one of the best thing. If you can't find any companion, just go ahead all alone. Nowadays there are various travel communities organizing "all girls trips". You can look for such groups here: https://www.tripoto.com/girls-only-trips
Yeah in Himachal you can go to Mcleodganj. That's quite nice and beautiful. You can go trekking to Triund there. Also you have many other places. From there you can go To Bir Biling for Paragliding
Try connecting to group/solo travellers through online portals/Facebook groups.There are ample like minded people ,we just don't happen to know them.Am also heading to himachal solo,but will b joined by solo travellers who i stumbled upon through Facebook groups heading to the same place.Happy Travelling!!