I can't do the Lotus pose.

Pose you might be comfortable with is sukasana, easy pose. The object is the easy alignment of the spine. Experiment by adding a pillow. Relaxed balance upon the ischial tuberosity, the sits bones. Pranayama comes before meditation. A few rounds of sama vritti, 4 equal parts in inhale, retention, exhale, retention, in easy pose, will lengthen and soften the spine. In a state of balance you mind is free to roam. It is not a matter of calisthenics.

 

Lotus Position
Lotus Position Is Essentially Sitting Cross-Legged With Your Right Foot Gently Resting On Your Left Inner Thigh, Heel Facing The Groin, And Your Left Foot Either Resting On Your Right Inner Thigh Or On The Ground. You Will Want To Sit Up Straight, Let Your Shoulder Blades Slide Down Your Back And Rest Your Hands Or Elbows On Your Knees. Many People Find This Position Difficult To Maintain At First, But With Daily Practice You Will Become More Flexible And Will Be Able To Hold The Position Comfortably For Long Periods Of Time.