So, how old are you? It's quite common to be super self-conscious when you are a teenager. Pray and ask God to give you more confidence and self-esteem. You are a special creation of God. Surrender your life to him and let him guide you. He will help you and show you the way. The Holy Spirit does many marvelous things for us and through us once we know the Lord. Read these Scriptures and mediate on them and read the book of John and when you are ready pray and the Lord to forgive you and come into your life.
For all have sinned and fallen short of the glory of God. Romans 3:23, see also Rom. 6:23
24 I can guarantee this truth: A single grain of wheat doesn’t produce anything unless it is planted in the ground and dies. If it dies, it will produce a lot of grain. 25 Those who love their lives will destroy them, and those who hate their lives in this world will guard them for everlasting life. John 12:24-25 (GOD’S WORD Translation)
For the sorrow according to the will of God produces a repentance without regret, leading to salvation; but the sorrow of the world produces death. II Corinthians 7:10
If we confess our sins, He is faithful to forgive us all our sins, and to cleanse us of all unrighteousness. I John 1:9, see also Isaiah 43:25
Behold, I stand at the door and knock. If any man (or woman or child) hears my voice and opens the door, I will come in to him and sup with him and he with me. Revelation 3:20, see also Ezekiel 36:26
Repent therefore and be converted, that your sins may be blotted out, and times of refreshing may come from the presence of the Lord. Acts 3:19, see also Isaiah 1:18
For as many as received Him, to them gave he power to become the sons of God, even to them who believe on His name. John 1:12, see also Ephesians 2:8-10
If any man (woman or child) be in Christ, he is a new creature. Old things are passed away; behold, all things are become new. II Corinthians 5:17, see also Ez. 36:27
For more understanding about salvation read: Isaiah 1:18-19; 55:6-9, Ephesians 2:8-10, Ezekiel 36:26-27. May God be with you now. Jesus is the way, the true way, the only way.
Read also John 1 and 3.
For the Baptism of the Holy Ghost read Luke 3:16, John 1:33, Acts 1:5, 8; 2:4; 11:16; 19:4-6 and the book of Acts (all).