So I only started shooting maybe 4 months ago, I finally was able to do it myself after watching my friend do it for me in the same spot.... But the last time I did it I couldn't stay in the vein, I had to keep trying and by the time I finally got the vein the blood in the syringe clotted. But i noticed a hard spot under the skin above my injection spot, it's very sore but it's not red.. Please help!!!