Does it seem that they would like you to join them, in order that you would fully belong with them? I caution that sharing the spirit of Christ cannot come by obligation - it has to come by a willing expression of love.
You could say that you appreciate the offer, and maybe just tag along to see how they do it. You never know whether The Holy Spirit might bring someone to ask for your opinion because they see that you are quietly and thoughtfully observing - Proverbs 17:28. That could be a spark for your enthusiasm. Or, you could pray for Him to encourage you and they should respect that God will bring you to have a passion for reaching the lost in His own good time.
People who we share the street with do overwhelmingly need to hear the truth .. but only the genuine truth flowing from God's own spirit through a contrite, honest and caring heart. If there is any sense of obligation, then it creates anxiety that turns our concerns toward our own interests, and it gives opportunity for sin (pride, wrath, etc) to manifest - detrimental to The Holy Spirit's work, the fruits of the flesh as have been mentioned here already.
Unfortunately, the shallow rote beliefs of a (present/passing) majority of Christians is such that they believe they have the right to tell people they will burn in hell if that person doesn't agree with them. Those ones also happen to not have the spiritual discernment (1 Corinthians 12:4-11) that equips us to recognise those who belong to Him and those who belong to the devil (1 John 3:10, 1 John 4:6).
God is love. The one who remains in love remains in God, and God in him - but those who do not have love have been lost. They have not come from death into life - they need to be "born again". Even those who call themselves Christian and teach their belief of the scriptures can be in this spiritually lost state .. while those who don't yet know that they should identify with Christianity - they can be of love as God is in them! .. so it doesn't all come down to belief alone, because individual knowledge contributes largely toward determining whether a person's beliefs are justified in God's sight. Our work is toward both those who are born of God, yet have not learned to be Christian, and those who have yet to have the life breathed into them.
It's a large theme on Christian Forums today! .. already there has been three threads about street preaching in the past hour, eg:
Speaking Of Ethics... What About Street Preaching?.
ONLY approach people if He tells you to do that! .. A great number of people carry hurts from having encountered people who do much harm in Jesus' name. Others are naturally fearful - wary of strangers, and it could cause them to think poorly of you.. to despise The Holy Spirit. Remember, it is Him whom we serve, as He works upon their mind in spirit (John 14:16-17) while we produce words that assist Him in changing their thoughts (Mark 10:44-45).
Those who have been harmed in Jesus' name also do not have spiritual discernment and knowledge to recognise that it was the children of the devil that had harmed them. They believe that the spirit of those ones is the spirit of Christianity and when we approach them in the same name (1 Corinthians 3:11), they prejudice us as also representing the same. Their fury can be intense and difficult to receive.. so I say to remain in prayer and asking Him for specific instruction to approach only those whom He desires for you to touch.
It seems that the content of what you are preaching is something that you aren't quite able to wear. This could indicate that maybe you need to refine your beliefs .. identify and purge any absurdities so that you can represent Jesus in full confidence (Mark 8:38).
2 Peter 2:1-2 tells us that 2,000 years ago, there were false doctrines creeping into Christianity that would destroy it (Romans 8:20-21, 2 Thessalonians 2:3) and would bring the way of truth into bad reputation. By identifying those false doctrines that have inevitably formed amidst your own faith (Jeremiah 9:6, Malachi 3:1-4), you will end up being much more thoughtful than calculative, and that is what people want when they are enquiring of Christ (James 1:19).
Then people should remember you as a nice person who gives good advice instead of someone who they should hate.
I have met people who are thoughtful and who enjoy talking, others who are hurting and are hurtful. It's always awesome to see the way that God brings a new way of thinking to a person .. someone who started as not really giving much thought to Christianity having a new interest in getting to know Him better. I'm talking about quality knowledge rather than a rote teaching.. a real relationship with Christ rather than a covenant with death.
This is the booklet that I most commonly share:
Adonai Reigns : The Gospel : God did not send his son to condemn the world!.