1.You are scared
Eliminate the fear of falling over :
By learning how to fall. When you break the movement down its actually quite simple and anyone can accomplish a safe fall with no gymnastic or acrobatic background. If you dont wish to rely on the wall or a spotter for the rest of your handstanding days this must be adressed. No bridge, forward roll or perfect cartwheel is required.
2.You are weak and dont have a plan
Strengthen the wrists, shoulders and body for faster progression and less likelyhood of injury :
Creating a solid physical structure is the first priority with any beginner. Lacking one is one of the main reasons more intermediate practicioners plateau or constantly experience injuries. Even simple things like having a proper wrist warmup and strengthening opposing muscle groups must not be ingored. Furthermore having a logical structure and process for spreading out practice on a daily, weekly and monthly schedule is a must. Progression wise, knowing which drill or skill to work on before the next can save years of frustration.
3.You are relying on luck and have not developed the ability to balance or enter a handstand
Learn how to both kick up into and balance a solid handstand :
By learning the individual movements that take place in a kickup then assembling them in the correct order. To consistently nail entries without relying on "luck" absolutely requires this.
But what happens once you actually get up there with reasonable "catchable" form? You must learn to rebalance. There is no magic handstand Nirvana, you are always falling. You just getting better at constantly saving or correcting back to "centre" Their are two main drills that develop this that ANY handstand coach worth their weight in butter will teach.
4.Your trying to learn a little bit of everything
Learn simple drills to correct alignment and achieve a straight handstand shape :
Whilst there is no set program that will work for every individual out there by focusing first on the straight handstand and then tuck you are developing both fine balance and then a stronger push and actively extended position of the shoulder. Straddle, stag and most other two arm variations then become much easier to layer on top. Think of the 80/20 rule. Work fewer "things" that get you the other "things" almost for free!
5. Your ignoring the 4 points above and will struggle to :
Learn to increase the time you can hold a handstand and build the confidence and skill necessary to leave the wall behind and be able to handstand anywhere
Only by exploring and developing the previous points can this be possible, Anyone can see this. Without physical strength and structure you wont hold long, without confidence and the ability to fall you wont kickup without the wall. Without skill and an understanding of technique you wont kickup and catch your balance or be able to maintain it.