More blocks could be indicative of stuttering less freely. Combined with the fact that you struggle with starting conversations, and it is situational, fear and other negative emotions are probably playing a big part Since you're asking for suggestions, I would explore voluntary stuttering. It will help desensitize you with stuttering moments and help you work on the fear. You can start this by stuttering on purpose while talking to yourself. After that, try with others. Then try to put yourself in situations you would normally avoid. Maybe start slow. For example, if you say hi instead of hello because you stutter on your hello, try that. Maybe with someone you feel very comfortable with. Then, work on situational avoidances. Also, try changing your mindset. While entering a conversation, don't think about how you will say it, think about what you are saying. Most importantly, disconnect a successful speaking moment from fluency. Think about going to counseling (non speech therapy). We all have built-in trauma, and the right therapist will help you with what I talked about. Once you explore all this, it's up to you if you want to try speech therapy. It will be more effective if you work on the other stuff first.